Question

A concave mirror produces 2 times enlarged real image of an object placed at
10 cm. Calculate the focal lenghth of the mirror.

Answer 1

Answer:

F=20

Explanation:

        M=2

U= -10 CM

2=-V/-10

V= 20 CM

1/V+1/U=1/F

1/20 + 1/- 10= 1/F

By LCM we get

-1/20=1/f

20=F

F=20