Question
Physics Question on Ray optics and optical instruments
A cylindrical lens is required to correct
A
myopia
B
presbyopia
C
hypennetropia
D
astigmatism
Answer
astigmatism
Explanation
Solution
A person suffering from astigmatism cannot see horizonta and vertical lines clearly, simultaneously. It is due to imperfect spherical nature of eye lens. This defect can be removed by using cylindrical lens.