Question

An object is kept at 30 cm distance from the concave mirror of focal length 60cm. find the distance from object of concave mirror

Answer 1

Given that - F = 60 cm

U = - 30 cm

V = ?

BY MIRROR'S FORMULA

1 / F = 1 / V + 1 / U

1 / 60 = 1 / V - 1 / 30

1 / V = 1 / 60 + 1 / 30 = ( 1 + 2 ) / 60

1 / V = 3 / 60 = 1 / 20

V = 20 cm