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A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror.

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asked Jun 6, 2017 in Physics by Kundan kumar (49,132 points) ● 34 ● 384 ● 1028
A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is

(a) – 30 cm (b) – 20 cm
(c) – 40 cm (d) – 60 cm

1 Answer

+1 vote
answered Jun 6, 2017 by Vikash Kumar (144,729 points) ● 8 ● 11 ● 21
selected Jun 10, 2017 by Kundan kumar
 
Best answer
(b) – 20 cm is the correct option.
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