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An object is located 51 millimeters from a diverging lensthe object has a height of 13 millimeters and thye image height is 3.5 millimetershow far in front of thelens is the image located?
The relation between the distance and height of an object and the image goes like this:L1/H1=L2/H2where L1 and H1 is the Length of the object from the lens and H1 is the height of the object respectively. Same goes for L2, H2 except these are for the image of the same object.If you put values in the above formula, the distance of the image from the lens comes out to be 13.73mm
Nouns ending with s take plural meaning?
No, there are many singular nouns that end with s, for example:one bossone busone cactusone dressone lensthe measlesthe newsthe nucleus
What is the area behind the cornea?
The area behind the Cornea in an eye is known as the Aqueous. It is filled with a thick liquid called Aqueous Humor.
Outer protective layer of the eye is the?
The sclera is the fibrous outer layer of the eye which retains the overall shape of the eye. This is commonly known as the white of the eye.
What two things change when light refracts?
Refraction is the bending of light when it passes through a substance.Microscopes, magnifying glasses, glasses, and telescopes all depend on refraction.Rainbows are created by refraction.When bow hunting for fish, an illusion is created about where it is. If one doesn't correct for the illusion, it is difficult to shoot the fish.
How do you change the fort bumper light 1997 maxima?
I'm going to re-phrase your question--how do you change the front bumper light in a 1997 Nissan Maxima. The submodel ( GLE, GXE, SE), doesn't make a difference, as all three versions have the same bumper mounted parking/turn indicators.Remove the two screws on each side of the lensThe entire lens and reflector can be pulled away from the bumperRemove the lens from the reflector assembly--don't loose the rubber gasketRemove the bulb by pushing and twisting, and then pull outReassemble by placing the lens over the reflector assembly--be sure to have the rubber gasket in the proper place. Also not the small tab on the upper side of the lens--this is installed firstPush the assembly back into the bumper and re-screw in the screws
What are two parts of eye which refract light rays?
LensThe lens is a transparent body behind the iris, the coloured part of the eye. The lens bends light rays so that they form a clear image at the back of the eye - on the retina. As the lens is elastic, it can change shape, getting fatter to focus close objects and thinner for distant objects.It bends as it 1. enters the cornea2. enters the lens3. leaves the lens
How do you replace headlight and turn signal bulbs on a Contour - Mystique?
There are 3 screws holding the headlight assembly/lens in place:2 are readily identifiable at each end of the front-top of the lensThe 3rd is set towards the back and lower.Remove those 3 and the whole lens comes out for easy bulb replacement.By the way, this is detailed and illustrated in the Owners Manual - See "Related Questions" below for morehead light removel on a 98 contourthere is three screws on each headlight housing open the hood and remove the screws theres two on top and one hiding behind the rad support after removing the screws grab the sides of the lights and pull out it should be a little tuff but it will pull out its preety much the same to put it back in Pop the hood turn on the lights hit the high beams locate the wire (connector) at the back of the headlamp assembly a quarter turn of the "boot" to the left should release it pull it out carefully twist out the bulb take the bulb with you to a parts store buy bulb reverse procedure!DougI would bet that it has some release clips at the back of the headlamp assembly. That's right the lenses are part of the assembly. A lot have a long flat plastic retaining clip that slides in from the top to lock a protruding pin into the sheet metal holder. I don't have one to look at to give you a definite answer about removing the assembly but my reply is mainly to let you know that if you are looking to replace them because they have clouded up then you should look for someone to polish and coat them instead. There are a few businesses popping up that do that now. I saw one locally called Clean & Clear or something like that. Try a search or check with some of your local used car dealers, those guys seem to do a lot of them for dealers.You can also polish them yourself with a liquid compound like Blue Magic (for one) plexiglass and plastic polish that Pep Boys or other parts stores sell. Use an orbital polisher or low speed angle polisher designed for polishing automotive paint. It only takes about 5 min. each. The only problem is that it (obviously) only helps the cloudiness on the outside and doesn't last very long, maybe 2-4 months. The pros that do that for a living actually use something to coat it that keeps them clear.Good luckgo to the blown bulb open the hood directly behind the bulb is a sort of cap with wires coming out of it give that a quarter to half turn and the light should pop out check the bulb for any retainer clips if none simply pull out the old bulb and put in the new one.(do not touch any glass surfaces on the new bulb the oil on your hands will cause the new bulb to develop a hot spot and burn out prematurelyThe easiest way is to remove the entire headlight assembly. There are two screws on top, easy to see, and one down behind holding a long piece of metal attached to the head light. Remove the headlight and replace the bulbs. Install is reverse.
What are the difference between human eyes and analog camera?
The eyes as we know is that part of the body which helps us see. The phenomenon of the working of the eye is very similar to that of a camera. The human visual is system (HVS) is as complicated as the working of a camera.Whatever we see, is the result of the message sent through the eyes to the brain. The brain interprets the signals sent from eyes to it hence allowing us to see what is in front of us. To understand a camera, human eyes should be understood first. It would be really fascinating to know the similarities and dissimilarities of both the processes.Both the human eye and a camera use something called a lens. In fact, they both use the same type of lens - a converging lens or also known as a convex lens. Converging lenses are like the ones in magnifying glasses.In the camera, the lens focuses the light onto a piece of film. The film has chemicals in it that basically trap the image on it, making it permanent. Instead of film, your eye uses something called a 'retina.' The retina has lots of little tiny things called 'rods' and 'cones' all over it. These are basically tiny antennae that tell your brain about the light that hits them. The rods tell your brain if there's light in a certain spot or not (a bit like a black and white photo) and the cones tell your brain what color the light is.There is one spot on the retina, though, that has no antennae at all. This is the spot where the nerve leaves your eye to go to your brain. At this spot, you can't see anything at all - it's called your 'blind spot.' This is one of the reasons that you have two eyes; what you can't see with one eye you can see with the other. Unlike your eyes, cameras have no blind spot, so they only need to have one lens.The individual components of the eye work in a manner similar to a camera. Each part plays a vital role in providing clear vision. So think of the eye as a camera with the cornea, behaving much like a lens cover. As the eye's main focusing element, the cornea takes widely diverging rays of light and bends them through the pupil, the dark, round opening in the center of the colored iris.The iris and pupil act like the aperture of a camera.The very back of the eye is lined with a layer called the retina which acts very much like the film of the camera.Our eyes, very quickly adapt to the bright light, but in comparison, take a longer time to get adjusted to a dark environment. This is the reason we can't see anything when we enter a dark-room while when we move out of it, it takes very less time to adjust to the bright sun-shine. Though our irises may hurt a little in this process of adaptation to the bright light. But in case of a camera, a photographer has to do the task. The fuzziness of the view has to be removed by adjusting and modifying the light. This is automatically done by retina in case of human eye.An interesting thing that I learned about pupils is that your pupil will also change size depending on what sort of mood you're in. But you sure can't tell the mood of a camera just by looking at it! Is it happy or is it sad? Hard to say.SHUTTER SPEEDVision is a continuous process of the human eye. But eye-lids act as shutters which creates a small time gap between two continuous visions. This small time gap is the shutter speed which is adjustable in case of camera but natural in case of human eye. According to researchers, an eye on an average has a shutter speed of around 1/50 of a second. Whereas, shutter-speed of a camera can vary from as less as 1/4000 of a second to as high as 2 seconds. Some cameras may even have an exposure time (shutter speed) of a few hours according to the need of the photographer.APERTUREAperture of the eye or the lens decides the depth of field that is the area which remains in focus. The size of the hole of the aperture allows the required amount of light entering in the eye or the camera which results the focusing of a particular object of the whole view. The aperture of our eye is the black spot in the centre of the eye. It can vary from 1mm in the brightest light to 9mm at the night time. This is why this black spot shrinks when we move out in bright sun-shine and expands when we enter a dark-room.Cameras and EyesThe structure and operation of the eye is very similar to an electronic camera, and it is natural to discuss them together. Both are based on two major components: a lens assembly, and an imaging sensor. The lens assembly captures a portion of the light emanating from an object, and focuses it onto the imaging sensor. The imaging sensor then transforms the pattern of light into a video signal, either electronic or neural.The camera and the eye have much more in common than just conceptual philosophy--the eye captures images as does the camera. The anatomy of the camera is more similar to that of a biological eyeball than many would imagine. Similar functions in common give the camera the appearance of a robotic eye. However, though there are many similarities between the two, they are by no means identical.Cornea and LensThe cornea is the "cap" of the eye; it is transparent (like clear jelly) and sits to the front of the eye and has a spherical curvature. The lens of a camera is also transparent (glass) and sits at the front of the body. Like the cornea, the lens also maintains a spherical curvature. The purpose of the corneal and lens curvature is to allow for the eye and camera to view, though not in focus, a limited area to both the right and the left. That is, without the curve, the eye and camera would see only what is directly in front of it.Iris and ApertureThe aperture is to the camera as the iris is to the eye. The aperture size refers to how much light is let into the camera to be reflected on the sensor or film. As with the human eye, when the iris contracts itself, the pupil becomes smaller and the eye takes in less light. When the iris widens in darker situations, the pupil becomes larger, so it can take in more light. The same effect happens with the aperture; larger (lower) aperture values let in more light than a small (higher) aperture value. The lens opening is the pupil; the smaller the opening, the less light let in.FocusBoth the eye and camera have the ability to focus on one single object and blur the rest, whether in the foreground (shallow depth of field) or off at a distance. Likewise, the eye can focus on a larger image, just as a camera (greater depth of field) can focus and capture a large scape.ScopeAs the eye, the camera has a limited scope to take in what is around it. The curvature of the eye and the lens allow for both to take in what is not directly in front of it. However, the amount of scope that the eye can take in is fixed, while a camera's scope can be changed by the focal length of different types of lenses.Retina and FilmThe retina sits at the back of the eye and collects the light reflected from the surrounding environment to form the image. The same task in the camera is performed either by film or sensors in digital cameras.
What is located in the anterior cavity of the eye?
aqueous humor. - the anterior cavity is actually divided into two subcategories. - the anterior chamber ( from iris to cornea) - the posterior chamber ( from iris to lens)
What are the parts of the eyeball?
All parts of the eye!Anterior ChamberThe space between the cornea and iris filled with Aqueous Humor.Aqueous HumorA water like fluid, produced by the ciliary body, it fills the front of the eye between the lens and cornea and provides the cornea and lens with oxygen and nutrients. It drains back into the blood stream through the canals of schlemm.BrainThe brain is where the electrical signals sent from our eyes are processed into vision. Damage to the brain can lead to vision loss if the visual cortex or optic pathways are damaged. The majority of nerve fibers in the optic tract connect to the LGN. Several nerve fibers leave the optic tract before the LGN to connect to sub cortical structures through out the brain. These parts of the brain regulate things like: eye and head movements, pupillary light reflex - (pupil size), and circadian rhythms - (light/dark cycle). Damage to these parts of the brain often leads to vision disorders too.Canals of SchlemmThese canals are located around the perimeter of the iris. They allow aqueous fluid to drain back into the blood stream. The Trabecular Meshwork along with the Canals of Schlemm regulate the eyes internal pressure. In the eye disease called glaucoma, these canals become blocked leading to increased pressure. The increased pressure, from this condition, destroys the optic nerve.ChoroidThe choroid is a layer of blood vessels between the retina and sclera; it supplies blood to the retina. In the disease called Macular Degeneration, abnormal blood vessels grow into the space between the retina and choroid damaging the macula.Ciliary BodyThis is where the Aqueous Humor is produced.Ciliary MuscleThe eye can bring the fine print in a phone book into focus, or focus in on the moon over ¼ million miles away. The ciliary muscle changes the shape of the lens - (this is called accommodation). It relaxes to flatten the lens for distance vision; for close work it contracts rounding out the lens. Everyone will develop an eye condition called presbyopia. As we age, the ciliary muscle and crystalline lens lose their elasticity. This is why most people need reading glasses by their 40's.ConjunctivaThe conjunctiva is a thin, clear membrane covering the front of the eye and inner eyelids. Cells in this lining produce mucous that helps to lubricate the eye. This is the eyes first layer of protection against infection. Inflammation of this membrane is called conjunctivitis, or pink eye.CorneaThe cornea is a clear, dome-shaped surface that covers the front of the eye. It is the first and most powerful lens in the eye's optical system. To keep it transparent the cornea contains no blood vessels. Tears that flow over it and aqueous humor in the chamber behind it keep it nourished. When you hear of eye banks and eye transplants, it is the cornea that is being replaced. The cornea can be damaged from: accidents, infections, and genetic defects.Crystalline LensThe eye's crystalline lens works like the adjustable lens in a camera. Positioned just behind the cornea; it is responsible for keeping images in focus on the retina. It is adjustable for distance and close work. A cataract is the lens clouding up. This happens to most people as they age. A few people are even born with cataracts. Modern surgery has all but eliminated cataracts as a cause of blindness in the developed world.EyeballThe eye is like a little video camera measuring about 1 inch or 2.5 cm. in diameter. If someone's eyeball is larger then this, they will be nearsighted (myopic); if it is smaller then this, they will be farsighted (hyperopic). Having two eyes gives us binocular vision - (depth perception). This is due to the fusing of both images in the visual cortex.Eyelashes and EyebrowsThese specialized hairs protect the eyes from particles that may injure them. They form a screen to keep dust and insects out. Anything touching them triggers the eyelids to blink.EyelidsOur eyelids protect and lubricate our eyes. Small oil-producing glands line the inner edge of our eyelids. These oils mix with tears when we blink, keeping the eye moist and clean.Eye SocketThe orbit or eye socket is a cone-shaped bony cavity that protects the eye. The socket is padded with fatty tissue that allows the eye to move easily.Fovea - (small pit)The fovea is an indentation in the center of the macula. Its diameter is only 1.5 mm or about 1/16 inch. This small part of our retina is responsible for our highest visual acuity. It is the center of our central vision.Lacrimal Gland - (Tear Duct)This gland continually releases tears and other protective fluids onto the surface of the eye. It lubricates and keeps the cornea from becoming dehydrated.Lacrimal SacThe lacrimal sac is a tiny pump that drains tears and other debris from the eye. The fluids flow down the nasolacrimal duct into the nose where they help keep the nasal linings moist. This is why your nose runs when you cry.Lateral Geniculate Nucleus - (LGN)This part of the brain acts as a relay station; it decodes visual information from the optic tract before sending it to the visual cortex for final processing.Lens Sack or CapsuleDuring modern cataract surgery the outer membrane of the lens is left in place. The artificial intraocular lens is placed in this sack.IrisThis is the colored part of the eye: brown, green, blue, etc. It is a ring of muscle fibers located behind the cornea and in front of the lens. It contracts and expands, opening and closing the pupil, in response to the brightness of surrounding light. Just as the aperture in a camera protects the film from over exposure, the iris of the eye helps protect the sensitive retina.Macula - (yellow spot)This part of the retina is the most sensitive. Its diameter is only 7 mm or about 1/4 inch. It is responsible for our central, or reading vision. This part of the retina gives us 20/20 vision. Without the macula, you would be blind - Legally Blind that is. People with eye diseases like Macular Degeneration have vision from 20/200 to 20/800.Optic ChiasmThis is the first part of the brain to receive visual input. Each eye takes a slightly different picture of the world. At the optic chiasm each picture is divided in half. The outer left and right halves continue back toward the visual cortex. The inner left and right halves cross over to the other side of the brain then continue back toward the visual cortex. See Drawing of optic pathways.Optic DiskThe optic disk is the spot on the retina where the optic nerve leaves the eye. There are no sensory cells here, creating a blind spot. Each eye covers for the blind spot of the other eye and the brain fills in the missing information.Optic NerveEach optic nerve has about 1.2 million nerve fibers. This is the cable connecting the eye to the brain.Optic TractThe nerves that connect the optic chiasm to the LGN are called the optic tract. If one of these tracts is damaged, vision will be lost in one side of each eye.Orbital MusclesSix muscles are in charge of eye movement. Four of these move the eye up, down, left and right. The other two control the twisting motion of the eye when we tilt our head. Defects in these muscles and the nerves that control them lead to conditions like Nystagmus and Amblyopia (Lazy Eye).Photoreceptor CellsThe retina is composed of two types of photoreceptor cells. When light falls on one of these cells, it causes a chemical reaction that sends an electrical signal to the brain.Cone cells give us our detailed color daytime vision. There are 6 million of them in each human eye. Most of them are located in the central retina - macula fovea area. There are three types of cone cells: one sensitive to red light, another to green light, and the third sensitive to blue light.Rod cells are about 500 times more sensitive to light then cone cells; they give us our dim light or night vision. They are also more sensitive to motion then cone cells. There are 120 million rod cells in the human eye. Most rod cells are located in our peripheral or side vision.Posterior ChamberThe space between the iris and the front of the lens filled with Aqueous Humor.PupilThe pupil is the hole in the center of the iris that light passes through. The iris muscles control its size.RetinaThe retina is the film of the eye. It converts light rays into electrical signals and sends them to the brain through the optic nerve. The sides of the retina are responsible for our peripheral vision. The center area, called the macula, is used for our fine central vision and color vision. The retina is where most the problems leading to vision loss Occur. Three of the leading causes of blindness, from retina damage, are Retinitis Pigmentosa, Macular Degeneration and Diabetic Retinopathy.Retinal Blood VesselsA doctor can see the blood vessels that supply the retina when he looks into your eyes. These vessels are in the choroid just beneath the retina. Abnormal blood vessel growth and leaking blood vessels are the cause of vision loss in eye conditions like, Diabetic Retinopathy, ROP, and Macular Degeneration.Retinal Pigment Epithelium - (RPE)The RPE is a layer of cells between the retina and choroid. The inside of a camera is panted black to absorb scattered and reflected light. The black pigment known as melanin in the RPE dose the same job for the eye. The RPE gets rid of waste products produced by the photoreceptor cells. As we age, the RPE can sometimes lose its ability to process this waste. Deposits of this waste, called drusen, can distort and damage the retina leading to an eye condition called dry macular degeneration.ScleraThe sclera is the white, tough wall of the eye. It along with internal fluid pressure keeps the eyes shape and protects its delicate internal parts.UveaThe uvea is the middle Vascular layer of the eye. It is made up of three parts: the iris, ciliary body and chorid. Uveitis is the inflammation (or swelling) of these parts of the eye.Visual AxisThe Visual Axis is an imaginary line drawn through the center of the pupil to the center of the Fovea. The orbital muscles keep the visual axis of both eyes aligned on the center of what you are looking at (fixation point). An eye condition called Strabismus - (misaligned eyes) results when the orbital muscles fail to keep the eyes in alignment. Any damage to eye structures along this axis leads to severe vision loss.Visual CortexThe part of the brain that processes and combines visual information from both eyes and converts it into sight. Damage to the visual cortex results in a condition called cortical blindness.Visual FieldsThe retina of each eye has two sections the nasal retina - (nose side) and temporal retina - (ear side). For example: with your right eye, you see the right half of the world with your nasal retina; you see the left half of the world with your temporal retina. The picture your eye takes is flipped left for right and upside down; its up to the brain to sort things out.Vitreous CavityThe space between the lens and retina filled with the gel like Vitreous Humor.Vitreous HumorThe vitreous humor is a jelly like liquid that fills most of the eye (from the lens back). As we age it changes from a gel to a liquid and gradually shrinks separating from the retina. This is when people start seeing floaters, dark specs in their vision. This is a normal sign of aging, but in a few cases the retina can become detached as the vitreous separates.ZonulesZonules are hundreds of string like fibers that hold the lens suspended in position and enable it to change shape for near or distant vision.Hope it helps xD!
