Question

A candle is held 100 cm away from a wall and a convex lens is placed between them. Twodistinctly different real images of the candle will be formed on the wall at two differentpositions of the lens if the focal length of the lens is​

Answer 1

Answer: f = 25cm

Explanation:

u= 50cm

v=50cm

1/v - 1/u=1/f

1/50 - (- 1/50) = 1/f

1/50 + 1/50 = 1/f

2/50=1/f

f= 25cm