Question

An object ‘o’ is placed at a distance of 100 cm in front of a concave mirror of radius of curvature 200 cm as shown in the figure. The object starts moving towards the mirror at a speed 2 cm/s. The position of the image from the mirror after 10s will be at …. cm.

Answer 1

Correct answer is 400

After 10 sec. 

u = -80 cm 

f = -100 cm

1/v + 1/u = 1/f

v = 400 cm