First slide

Spherical/Curved mirrors

Question

An object 1cm tall is placed 4cm infront of a mirror. In order to produce an upright image of a 3cm height one needs a

Moderate

A

Convex mirror of radius of curvature 12 cm
B

Concave mirror of radius of curvature 12 cm
C

Concave mirror of radius of curvature 4 cm
D

Plane mirror of height 12 cm

Solution

Erect and enlarged image can produced by concave mirror.
$\frac{I}{O} = \frac{f}{f - u} \Rightarrow \frac{+ 3}{+ 1} = \frac{f}{f - (- 4)} \Rightarrow f = - 6 cm \Rightarrow R = 2 f = - 12 cm$

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