Question

the focal lenth of a camera lens is 20 cm find how far away from the film must the lens be set in order to photograph an object located at a distance 0f 100cm from the lens !!!!! NO SPAMS OR ACCOUNT WILL BE DELETED

Answer 1

Explanation:

given focal length = 20cm

object distance = 100cm

image distance = ?

formulae we are going to use is

1/f = (1/i) + (1/o)

1/20 = 1/100 + 1/i

1/20 - 1/100 = 1/i

(5 - 1)/100 = 1/i

4 * i = 100

i = 100/4

i = 25

Answer 2

Answer:25cn

Explanation:

I/f=1/u+1/v

F=20cm

U=100cm

V=Xcm

1/20=1/100+1/x

1/20-1/100=1/x

5-1/100=1/x

4/100=1/x

4x=100

x=25cm