A `12 m` tall tree is to be photographed with a pin hole camera. It is situated `15 m` away from the pin hole. How far should the screen be placed from the pin hole to obtain a `12 cm` tall image of the tree ?

Answer

15 cm

Explanation

Here, `h_1 = 12 m, u = 15 m`
`v = ? H_2 = 12 cm = 0.12 m`
As `(h_2)/(h_1) = (v)/(u)`
` :. v = (h_2)/(h_1) xx u = (0.12)/(12) xx 15 = 0.15 m = 15 cm`.