First slide

Spherical/Curved mirrors

Question

An object of length 6 cm is placed on the principal axis of a concave mirror of focal length f at a distance of 4f. The length of the image will be

Moderate

A

2 cm
B

12 cm
C

4 cm
D

1.2 cm

Solution

$\frac{I}{O} = \frac{f}{f - u} \Rightarrow \frac{I}{+ 6} = \frac{- f}{- f - (- 4 f)} \Rightarrow I = - 2 cm$

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