Q.

An object approaches a convergent lens along principal axis from the left of the lens with a uniform speed 5 m/s and stops at the focus. The image

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a

Moves away from the lens with an uniform speed 5 m/s

b

Moves towards the lens with an uniform speed 5 m/sec

c

Moves away from the lens with acceleration

d

Moves towards the lens with acceleration

answer is C.

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Detailed Solution

For convex lens, as object approaching focus the image will move away from the lens to infinity and so it should has acceleration.
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An object approaches a convergent lens along principal axis from the left of the lens with a uniform speed 5 m/s and stops at the focus. The image