Question

An object is placed at a distance of 30 cm from concave mirror of focal length 20 cm . Where will the image be formed?

Answer 1

u = -30cm

f= -20cm

by mirror formula

1/v+1/u = 1/f

1/v = -1/20+1/30

=-10/600

v=-60cm

Answer 2

Answer: -60cm

Explanation:

u = -30cm

f= -20cm

by mirror formula

1/v+1/u = 1/f

1/v = -1/20+1/30

=-10/600

v=-60cm