Question

A 5 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. If image distance is thrice the focal length, find object distance, image distance and nature of image.

Answer 1

Given that Focal length of lens = + 20 cm 

Object distance = -u 

Image distance (v) = + 3u

So the object is between F₂ and 2F₂ . So the image beyond 2F₁ it is real, inverted, and magnified.