Question

a 12m tall tree is photographed in a pin hole camera . it is situated 15m away from the pin hole. how far the screen be placed to get the12m tall image of the tree?

Answer 1

Solution;

Take object distance as u

Image distance as V

Object height as ho

Image height as hi

Magnification=Image distance, v/object distance u=Image height, hi/object height,ho.

ho=12m

hi=12m

v=15m

u=?

=15/u=12/12

making u the subject, u=1/15m=6.67cm.

Answer; =6.67cm