Question

An object is placed 20 cm from the concave mirror of focal length 10 cm, then image is formed at?

Answer 1

Answer:

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Answer 2

$\huge \bf{Solution.}$

Given, focal length of concave mirror, f = –10 cm

Distance of object from the concave mirror, u =

–20 cm

From the mirror formula,

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

$\frac{1}{20} + \frac{1}{v} = \frac{1}{ - 10}$

$\frac{1}{v} = \frac{1}{20} - \frac{1}{10}$

$\frac{1}{v} = \frac{1 - 2}{20}$

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

$v = - 20 \: cm$

Hence, the image is formed at the centre of

curvature of mirror.