Question

What is astigmatism ? Explain ? How is it removed Draw a diagram for the same ?

Answer 1

Astigmatism: This defect is when the light rays do not all come to a single focal point on ... lines running in one direction appear sharp whilst those in other directions appear blurred .

Answer 2

Astigmatism is a defect in which a person cannot focus on horizontal and vertical lines at the same time.

It can be removed by using cylindrical lenses.