First slide

Spherical/Curved mirrors

Question

An object is placed at 20cm from a convex mirror of focal length 10cm. The image formed by the mirror is

Moderate

A

Real and at 20 cm from the mirror
B

Virtual and at 20 cm from the mirror
C

Virtual and at $\frac{20}{3} cm$ from the mirror
D

$Real and at \frac{20}{3} cm from the mirror$

Solution

$u = - 20 cm, f = + 10 cm also \frac{1}{f} = \frac{1}{v} + \frac{1}{u} \Rightarrow \frac{1}{+ 10} = \frac{1}{v} + \frac{1}{(- 20)} \Rightarrow v = \frac{20}{3} cm; virtual image.$

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