Question: A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin

A 10 mm long awl pin is placed vertically in front of

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 (c) - 40 cm (b) - 20 cm (d) - 60 cm

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