What is astigmatism ? Explain ? How is it removed Draw a diagram for the same ?
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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 .
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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.
It can be removed by using cylindrical lenses.
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