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It's because to change focus, the eye distorts the lens and so the lens has to be flexible. In camera lenses, the lens elements are moved back and forth to focus - it's difficult to see how that kind of mechanism could evolve; but the lens distortion system is similar(ish) to the way muscles work.
Wiki User
∙ 13y ago
Wiki User
∙ 14y agoThe muscles of the eye surrounding the lens change the shape of the lens in order to focus light on near and far objects. If the lens were not able to flex, then this focusing action would be degraded. A condition called "Presbyopia" which occurs in old age is the loss of flexibility of the lens, making focusing on nearby objects difficult.
Wiki User
∙ 13y agoThe lens is flexible so it can change shape, focusing on objects close up and objects that are far away.
Wiki User
∙ 12y agoThe lens is flexible, allowing a clear focused image to be formed in the retina. The ciliary muscles control the shape of the lens, this process is called accommodation.
Wiki User
∙ 13y agoTo collect light.
To collect light.
To collect light.
To collect light.
Wiki User
∙ 13y agoTo collect light.
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What is the appearance and texture of the vitreous humor?
The 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. See related link for more details.
Which intrusive feature may start as a sill but as more magma builds it pushes upward like a lens?
Which intrusive feature may start as a sill but, as more magma builds, it pushes upward like a lens?
What are the parts of the that eye that similar to the camera?
In a camera the following parts could be considered equivalent to the parts of a human eye:Optical diaphragm = IrisAperture in optical diaphragm = PupilOuter lens element / lens glass = CorneaInner lens element = Eye lensCCD Sensor (in a digital camera) = RetinaThis is a huge simplification of a very complex topic. Please see the related links for more information.
How does a refracting telescope produce an image?
A refracting telescope works just like a magnifying glass. It uses a convex glass lens (to bend light and bring it into focus. This lens is thicker in the center than it is toward its edges, which bends the light more at the edge of the lens than light coming through the center. This allows all of the light to come together at a focus point. The point of focus is where the image is created. If someone looks into the eyepiece, a concave lens magnifies the image Refracting telescopes have two main problems-images are not always clear because the light is being bent and the size of the lens is limited (which limits the power of the telescope).
You got 10mm lens and 20mm lens for your telescope What is the difference?
10mm lens is more powerful than the 20mm lens
What is the word origin for hand lens?
A hand lens is nothing more than a hand-held magnifying glass. The term "hand lens" is used primarily in a laboratory setting. The lens, or glass, is set into a frame with a handle attached. The fictional Sherlock Holmes popularized the hand lens, or magnifyng glass when looking for clues to solve a mystery.
What microscope uses two of more glass lenses to magnify living or prepared slides?
All microscopes use more than 1 lens. A magnifying device with only 1 lens is called a magnifying glass.
Is it possible for a lens to act as a convergent lens in one medium and a divergent lens in another?
Yes. A lens makes use of the property that when light travels from a less dense medium (air) into a more dense medium (glass) it bends toward the surface normal. And when it travels from a more dense medium to a less dense medium it is bent away from the surface normal. So if the lens were placed in a more dense medium then itself the typical direction of light bending would be reversed. You should get a complete reversal of the roles played by a convex lens and a concave lens if you made a cavity inside a glass block in the shape of a lens. A concave glass lens in air does not give a real image but a concave cavity in a glass block should give a real image, in the block.
What is a jar of jelly?
Its like jam but more jellier
How is the total magnification of a microscope determined?
Total magnification is determined by multiplying the magnification of the ocular lens by that of the objective lens. Compound microscope that uses more than one lens to direct light through a specimen mounted on a glass slide.
What is the jelly like fluid which organelles float?
Cytoplasm, which is made up of cytosol, water, and more.
What is the appearance and texture of the vitreous humor?
The 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. See related link for more details.
Why convex lens of short focal length is preferred on magnifying glass?
The power of a lens is measured in dioptres which is the reciprocal of the focal length in metres. A 5-dioptre lens would allow you to see something at a distance of 20 cm, while a 20-dioptre lens would allow the object to be seen from 5 cm (2 inches) so it would be more effective as a magnifying glass. Your arms are short.
What can you use to make a fake jelly for a prop plastics or the like not plaster of Paris as want it to look clear and jelly like for cheap?
Clear/transparent bathtroom silicon (like caluk) with a tiny amount of oil paint in a jelly mould.Resin with pigment in a silicon jelly mould (More expensive but effective)Actual jelly (like gelatin) but no flavourings just food dye (look for ballistic gel recipie) in a jelly mould
If a telescope has an objective lens of 3 inches what is the focal length?
The size (diameter) of a lens does not determine its focal length. The amount of curvature of the lens does. Citing a diameter for a lens doesn't help us find the focal length. Lenses are ground to specifications that allow short or long focal length. The more curved the lens, the shorter the focal length. You can see this if we specify a given curvature and then start to "flatten" the lens. The focal length will get longer and longer as the lens is flattened. When the lens is flat (has to curvature) the lense has an infinite focal length, just like a piece of flat glass.
Which intrusive feature may start as a sill but as more magma builds it pushes upward like a lens?
Which intrusive feature may start as a sill but, as more magma builds, it pushes upward like a lens?
What would be more affected underwater a convex mirror or a concave lens?
what do you call a curved piece of glass or other transparent material that refracts light
