Assertion: Astigmatism is due to uneven curvature of lens.
Reason: It is treated with cylindrical lenses.
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(c) If the Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.
(e) If the Assertion is incorrect but the Reason is correct.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
Explanation:
Astigmatism is a kind of defect of vision in which the image of an object is distorted. It is because all the light rays do not come to focus on retina. It is due to abnormal curvature of the lens . It can be corrected by wearing cylindrical lenses.