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Question

A point object is placed 20 cm left of a convex lens of focal length f = 5 cm (see the figure). The lens is made to oscillate with small amplitude A along the horizontal axis. The image of the object will also oscillate along the axis with.


A

amplitude A9, out of phase with the oscillations of the lens

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B

amplitude A3, out of phase with the oscillations of the lens

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C

amplitude A3, in phase with the oscillations of the lens

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D

amplitude A9, in phase with the oscillations of the lens

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Solution

The correct option is A

amplitude A9, out of phase with the oscillations of the lens


1v+120=15
v=203cm
Δxi=+v2u2Δx0
Δxi=A9 out of phase with lens
Hence (A) is correct


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