Question

A thin linear object of size 1mm is kept along the principal axis of a convex lens of focal length 10cm. The object is at 15cm from the lens. The length of the image is:
A. 1mm
B. 4mm
C. 2mm
D. 8mm

Answer 1

Correct Answer - B

`1/10 =1/V-1/((-15))rArr v=+30 cm`
For small object `dv=(v^(2))/(u^(2))du(30/15)^(2) xx1=4 mm`