Question

A diverging lens of 20 cm focal length forms on image 15 cm from the lens. What is the distance of the object from the lens?

• A. 20 cm
• B. 15 cm
• C. 60 cm
• D. 30 cm

Answer 1

The correct option is C 60 cm

Using lens formula as :

$\frac{1}{v}-\frac{1}{u}=\frac{1}{f}$

$\frac{1}{15}-\frac{1}{20}=\frac{1}{u}$

$u=60cm$