Question

Liya is testing concave lenses to make good eyepieces for her binoculars before the next mission.Liya places a 14cm long pin to the left of a concave lens. She obtains a 2.0 cm long virtual image at a distance of 3.0cm to the left of the lens.The position of the pin from the lens is

Answer 1

ANSWER IS

-21 cm

h=14

hi=2

v=-3

u=?

hi/h=v/u

2/4=-3/u

u=-3*14/2

u=-21