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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. The focal length of this mirror is

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

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(b) – 20 cm is the correct option.

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