Question

The focal length of a camera lens is 20 cm how far away from the film must be the lens be set in order to photograph an object located at a distance of 100 centimetre from the lens. Answer this question and earn 100 points

Answer 1

Answer:

Answer in the attachment pls see it

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Answer 2

Explanation:

Given,

f = 20

U = 100

v= ?

Then,

according to formula,

1/f = 1 /u + 1 /v

1/ 20 = 1 /100 + 1/v

1/20 - 1/100 = 1/v

(5 - 1)/100 = 1/v

4/100= 1/v

4v= 100

v= 100/4

v= 25