Question

a 2cm high candel flame is placed at a distance of 80cm from a white screen on playing a convex lens exactly at a mid point of the candel and the screen a distant image of the flame is scene on the screen, what is the focal length of the lens and size of the candel flame image formed and draw the ray diagram

Answer 1

Focal length of the lens = 80 / 40 = 2 cm