0
This is a lens which is designed to help someone who has problems seeing at distance (myope), the light rays going into your eye are not hitting the fovea (the part of the eye located on the retina which allow you to see clearly) in the proper place, these rays are falling in front of the fovea, so by using a concave ( a minus lens) lens, this moves these light rays by diverging them and moving them back to the fovea which allows for clear vision at distance. At least this is how a concave lens is used optically speaking.
this is from winter006: concave mirrors are used in stores and gas stations to see a wider area of the store.
It's also called , a Diverging Lens .
It is thinnest in the centre and spreads light out , so it gives a diminished image .
Wiki User
∙ 9y ago
Wiki User
∙ 9y agoA concave lens of suitable focal length is used to remove short sightedness of the eye because the light rays that fall on such lens fall further back on the eye's retina. Since short sightedness of the eyes are caused by light rays falling short, using a concave lens solves the problem.
Wiki User
∙ 10y agoA convex lens is used to corrent long-sightedness (hyperopia) because in a hyperopic person, the image is focused behind the retina.
The inability to see the distant objects is referred to as short sightedness.
Short sightedness refer to the inability to see very distant objects.
Wiki User
∙ 13y agoThe visual impairment of being near-sighted is known as myopia. The problem for individuals with myopia is that the incoming light focuses too early in the eye--the focal point of the eye/lense system does not fall on the fovea of the retina correctly. In order correct this, glasses are used to alter the incoming light. In the case of nearsighteness, it is desired that the light focus deeper in the eye and a concave lens is used to slightly "enlarge/diverge" the image.
Wiki User
∙ 11y agoBecause light rays coming from the distant object are now diverged by the concave lens so that they appear to be coming from the eye's own far point F. Therefore, rays are focused on the retina, thus forming a sharp image.
Wiki User
∙ 9y agoA concave lens is used for correcting nearsightedness. They work to make things look smaller. A concave lens magnifies the light on a flashlight an they are used in peepholes on doors.
Wiki User
∙ 14y agoA concave lens is used to correct short-sightedness,while convexed lens are used to correct long-sightedness.
Wiki User
∙ 15y agoexplosive diarrhea
Add your answer:
Earn +20 pts
When a person is far sided do the need a concave lens or convex lens?
Farsighted people use convex lenses to correct their vision.(This is the correct answer!)
If a person is farsighted do they need concave or convex lenses?
They need a concave lens
What lenses would you use for short sightedness and long sightedness?
far short sight you can use concave lenses far long sight you can use convex
Should a farsighted person use a concave or convex?
You must use convex lenses because in farsighted person the image is formed at the back of retina so it must be move forward to make it exactly in the retina so convex converges so it will be forwarded.
Type of image of convex lens?
a convex lens looks like an oval from the side. it can be used in the glasses of a long sighted person. i really should be doing my homework right now. i have been doing it since 11am and it is now 15.43pm.
When a person is far sided do the need a concave lens or convex lens?
Farsighted people use convex lenses to correct their vision.(This is the correct answer!)
What kind of lenses would a farsighted person need to correct their vision?
Hyperopic, plus powered, or convex lenses.
If a person is farsighted do they need concave or convex lenses?
They need a concave lens
How does a convex lens fix eye problems?
A convex or converging lens can fix eyes with long sighted vision. A person who is long sighted cannot focus on near objects which can be corrected by wearing a convex lens.ÊÊ
What lenses would you use for short sightedness and long sightedness?
far short sight you can use concave lenses far long sight you can use convex
Should a farsighted person use a concave or convex?
You must use convex lenses because in farsighted person the image is formed at the back of retina so it must be move forward to make it exactly in the retina so convex converges so it will be forwarded.
Type of image of convex lens?
a convex lens looks like an oval from the side. it can be used in the glasses of a long sighted person. i really should be doing my homework right now. i have been doing it since 11am and it is now 15.43pm.
Why would concave be used for near sighted?
A farsighted person can see distant objects clearly, but nearby objects appear blurry. The eyeball is too short, so the image that falls on the retina is out of focus. A convex lens corrects this by bending light rays toward each other before they enter the eye. An image then focuses on the retina.
What does a negative 5 mean in eyesight?
The person is moderately myopic (short sighted or near sighted). The person can see things that are closer clearly but things that are far will be out of focus. The eye is bulged and the image forms in front of the retina and a concave lens with -5 power will help in forming a clearer image on the retina.
Are you long sighted if you are myopic?
A myopic person is a near sighted person
What lens used to correct nearsightedness?
Convex lenses are thicker in the middle then the edges and concave are thicker at the edges then the middle. When light travels through lenses, refraction occurs. The light bends either outward or inward, it depends on the lens.The lens of your eye is a double convex lens. Its job is to focus the image on the retina of the eye. If one is farsighted, the lens in the eye causes the focus to be behind the retina. These people see far but have some difficultly seeing close-up.To correct this farsightedness, the person would wear glasses or contacts with convex lenses, for It is often used for close examination of small objects.
Why concave lens is the lens could correct the image formed of a nearsighted person?
Human eye is optical miracle.Depending on the distance of the object, we have to change the position of the screen.In case of human eye, screen (Retina) is kept at fixed distance and eye lens is elastic and it becomes more or less thin or thick, so as to adjust image on retina. This phenomena is called accommodation. In near sighted persons lens is more convex than it should be. So we put concave lens in front of eye, so that image of distant object should fall on retina. Human brain is also miracle and after few days, it starts guessing the actual distance of the object.
