First slide

Ray optics

Question

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

Moderate

A

Real and at 20cm from the mirror
B

Virtual and at 20cm from the mirror
C

Virtual and at 20/3cm from the mirror
D

Real and at 20/3cm from the mirror

Solution

$\frac{1}{f} = \frac{1}{v} + \frac{1}{u}$ for spherical mirror
$\frac{1}{10} = \frac{1}{v} - \frac{1}{20}; v = + \frac{20}{3} cm$

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