Question

A student stands at a distance of 1.6 m in front of a camera with focal length of 5 cm, to obtain a sharp image on the film, how far must the lens be from the film?

Answer 1

Gives we

U=-1.6m

f=5cm

$\frac{1}{v}-\frac{1}{u}=\frac{1}{f}$

$\frac{1}{v}-\frac{1}{-1.6}=\frac{100}{5}$

$v=4.8cm$

We know that

$m=\frac{v}{u}=\frac{d_2}{d_1}$

$m=\frac{4.8}{-160}=\frac{d_2}{5}$

$d_2=0.15$ cm