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An object of heights 5 cm is placed at 20 cm from a concave mirror of focal...

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Question 23

An object of heights 5 cm is placed at 20 cm from a concave mirror of focal length 10 cm. the image height is?

A

20 cm

B

15 cm

C

10 cm

D

5 cm

Explanation

Share Answer (1)/V + (1)/U = (1)/f
(1)/V + (1)/20 = (1)/10
(1)/V = (1)/10 - (1)/20 = (2 -1)/20 = (1)/20
V = 20 cm
mag = (image height)/object height = (v)/u
(X)/5 = (20)/50
X = 5 cm

Correct option: D

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