Astigmation is correct by usingA. culindrical lensB. plano convex lensC. plano concave lensD. convex lens

Astigmation is correct by usingA. culindrical lensB. plano convex lens

1.	Astigmation is correct by usingA. culindrical lensB. plano convex lensC. plano concave lensD. convex lens
Answer» Correct Answer - A In this defect, eye cannot perpendicular direction clear, i.e. horizontal and vertical lines simultaneously. It is due to imperfect spherical nature of eye lens. This defect can be removed by using cylindrical lenses. (Torric lenses)

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An infinitely long rod lies along the axis of a concave mirror of focal length f. The near end of the rod is distance `u gt f` from the mirror. Its image will have lengthA. `(uf)/(u-f)`B. `(uf)/(u+f)`C. `(f^(2))/(u+f)`D. `(f^(2))/(u-f)`
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Astigmation is correct by usingA. culindrical lensB. plano convex lensC. plano concave lensD. convex lens

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