A camera is equipped with a lens with a focal length of 31 c

A camera is equipped with a lens with a focal length of 31 cm. When an object 3.0 m (300 cm) away is being photographed, what Is the magnification

Solution

1 / f = 1 / v + 1 / u

1 / v = 1 / 31 - 1 / 300

v = 34.57 cm = 0.35 m

magnification = v / u = 0.35 / 3.0

= 0.117