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Question

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


A
its first focus
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B
its optical centre
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C
its second focus
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D
the centre of curvature of its second surface
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Solution

The correct option is C its second focus
The parallel rays of light 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 known as the second focus of the lens.
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Physics

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