Question

5. 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) -40cm
(d) -60 cm​

Answer 1

option number is

(C) -40cm

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Answer 2

Explanation:

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