Question

A converging lens of focal length 50 mm is to be used as a magnifying glass for inspecting stamp A rectangular stamp, which is 20 mm 40 mm, is placed 30 mm from the lens, find the length of the image of the 20 mm side of the stamp A. 50 mm C. 85 mm B 60 mm D. 20 mm​

Answer 1

Explanation:

M = f / ( f + u) using sign convention

M = 50 / ( 50 - 30)

= 5/2

I / o = 5/2,

I = 5/2 x 20

= 50 mm.