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 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

in Google is wrong please give the correct answer within 1 minute​

Answer 1

Answer:

-40cm is correct as it is a rectangular shape

Explanation:

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