First slide

Spherical/Curved mirrors

Question

A concave mirror gives an image three times as large as the object placed at a distance of 20cm from it. For the image to be real, the focal length should be

Moderate

A

$10 cm$
B

$15 cm$
C

20cm
D

30 cm

Solution

$m = \frac{f}{f - u} \Rightarrow - 3 = \frac{f}{f - (- 20)} \Rightarrow f = - 15 cm$

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