1.

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. What is the focal length of te mirror ?​

Answer»

Answer:

60

Explanation:

a/c question U GOT first magnifiaction =(-V/u=-1/2)

then u should APPLY magnifiaction =-v/u...where v given=30..from here u got u=-60.then apply MIRROR formula...1/v+1/u=1/f...where v=30and u=-60



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