Question

A short linear object of length 2 mm lies on the axis of a convex mirror of focal length 20 cm and distance 20 cm from the mirror. The length of image is

1) 1 mm 2) 2 mm 3) 0.5 mm 4) 0.25 mm

Answer 1

Answer:

1mm

Explanation:

1/f = 1/v + 1/u

using sign conv:

1/v = 1/f + 1/u

1/v = 1/20+ 1/20

v=10cm

applying formulae

Hi/Ho = v/u

Hi= 10/20 X 2

Hi= 1mm

hope it helps. =D