Question

An object is placed at a distance of 25 cm froma concave mirror of focal length 20 cm. Find the distance and nature of the image

Answer 1

Given,

Object distance, $u=25cm$

Focal length, $f=20cm$

From mirror formula

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

$\frac{1}{-20}=\frac{1}{v}-\frac{1}{25}$

$\Rightarrow \frac{1}{v}=-\frac{1}{20}+\frac{1}{25}$

$v=100cm$

The image will be real, inverted magnified