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  • An object approaches a convergent lens from the left of the lens with a uniform speed 5 m/s and stops at the focus. The image A. moves away from the lens with a uniform speed 5 m/s. B. moves away from the lens with uniform acceleration.

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

A. moves away from the lens with a uniform speed 5 m/s.
B. moves away from the lens with uniform acceleration.
C. moves away from the lens with a non-uniform acceleration.
D. moves towards the lens with a non-uniform acceleration.

Answers (1)

The answer is option (c).

The image will move away from the lens with a non-uniform acceleration. In this case, the objects are moving with a uniform speed of 5 m/s towards a convergent lens from the left; thus, with a non-uniform acceleration, the image moves away from the lens. The image starts at a uniform speed but gets accelerated going from 2F to F; the image goes from 2F to infinity. When the image is at 2F, both the object and image will have the same speed.

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