A diverging lens has a focal length that has a magnitude of

A diverging lens has a focal length that has a magnitude of 31.0 cm. An object is placed 18.0 cm in front of this lens. Calculate the magnification.

Ans:_____________

Solution

for diverging lens,

f = -31 cm

do = 18 cm

Applying Lens equation,

1/f = 1/do + 1/di

1/(-31) = 1/18 + 1/di

di = - 11.4 cm

magnification = - (di / do) = - ( - 11.4 / 18) = 0.63