Question

Flat surface of a plano-convex lens of focal length 20 cm is silvered. If object is placed at 60 cm from lens then distance of image from lens is

• A. 60 cm
• B. 30 cm
• C. 12 cm
• D. 15 cm

Answer 1

The correct option is C 12 cm


$\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\Rightarrow \frac{1}{10}=\frac{1}{v}+\frac{1}{60}$
$\Rightarrow v=12cm$

Due to reflection image is formed between lens and object.