question_answer 38)

  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 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

Answer:

  (c) When an object approaches a convergent lens from the left of the lens with a uniform speed of 5 m/s, the image moves away from the lens with a non uniform acceleration. For example, if = 20 m and and - 35 m; we get = 33-3 m ; 36 m ; 40 m and 467 m. Clearly, image moves away from the lens with a non uniform acceleration. Choice (c) is correct