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Question : 31
Total: 39
State reasons for Myopia. With the help of ray diagrams, show the
(a) image formation by a myopic eye, and
(b) correction of myopia using an appropriate lens.
(a) image formation by a myopic eye, and
(b) correction of myopia using an appropriate lens.
Solution:
Myopia is a defect of vision in which a person clearly sees all the nearby objects, but is unable to see the distinct object comfortably and his eye is known as myopia eye.
Myopia can be caused by:
1. increase in curvature of the lens.
2. increase in the length of the eye ball.
(a) A myopic eye has its far point near that infinity. It forms the image of a distinct object in front of the retina as shown in the figure.
Myopia can be caused by:
1. increase in curvature of the lens.
2. increase in the length of the eye ball.
(a) A myopic eye has its far point near that infinity. It forms the image of a distinct object in front of the retina as shown in the figure.
(b) Concave lens has an ability to diverge incoming rays, it is used to correct this defect of vision. The image is allowed to form at the retina by using a concave lens of suitable power as shown in the figure.
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