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Q.

A ray of light is incident on a lens parallel to its principal axis. After refraction, the ray passes through or appears to come from:

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a

its optical centre

b

its first focus

c

its second focus

d

the centre of curvature of its second surface

answer is B.

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Detailed Solution

The parallel rays of light will meet at a point on the principal axis after refraction by a convex lens or appear to come from a point on the principal axis after refraction by a concave lens. This point is called the second focus of the lens.

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