A convex lens of focal length $ 15 \mathrm{~cm} $ is placed on a plane mirror. An object is placed at $ 30 \mathrm{~cm} $ from the lens. The image formed is:

Question

A convex lens of focal length $ 15 \mathrm{~cm} $ is placed on a plane mirror. An object is placed at $ 30 \mathrm{~cm} $ from the lens. The image formed is:, Real, at $ 30 \mathrm{~cm} $ in front of the mirror, Real, at $ 30 \mathrm{~cm} $ behind the mirror, Real, at $ 10 \mathrm{~cm} $ in front of the mirror, Virtual, at $ 10 \mathrm{~cm} $ behind the mirror

MARKS App · Accepted Answer

1 F = 1 f 1 + 1 f m + 1 f 1 = 2 f 1 + 1 ∞ ⇒ F = 15 2 c m 2 15 = 1 30 + 1 v , v = 10 c m ∴ image is real, 10 c m in front of mirror.

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