Question

A movie projector is equipped with a 0.499 m focal length lens that is positioned 0.503 m from the film. How far in m from the lens must the screen be if the image on it is to be in focus? Record your answer to two decimal places

Answer 1

here,

focal length,f = 0.499 m

object distance, do = - 0.503 m

let the image distance is di

Using lens formula

1/f = 1/di - 1/do

1/0.499 = 1/di + 1/0.503

di = 62.75 m

the distance of the image is 62.75 m