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Question
Astigmatism is corrected by the use of
Astigmatism is corrected by the use of
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Solution
The correct option is D Cylindrical lens
- Convex lens converge the light rays and decrease the focal length.
- Concave lens diverge the light rays and increase the focal length.
- Cylindrical lens have curved surfaces that focus the light rays to a point.
Astigmatism occurs due to imperfection in curvature of eye due to which light rays are focussed inaccurately on the retina and this is corrected by using cylindrical lens.So, the correct answer is 'Cylindrical lens'.
- Convex lens converge the light rays and decrease the focal length.
- Concave lens diverge the light rays and increase the focal length.
- Cylindrical lens have curved surfaces that focus the light rays to a point.
Astigmatism occurs due to imperfection in curvature of eye due to which light rays are focussed inaccurately on the retina and this is corrected by using cylindrical lens.
So, the correct answer is 'Cylindrical lens'.
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