Question

A lens forms the image of an object placed at 15cm from it, at a distance 60cm on the other side of the lens. find the focal length of the length.
Ans with clear steps. ​

Answer 1

Explanation:

GIVEN :

1. U = 15cm ;
2. ;V = 60cm ;
3. ;F = ? ;

SOLUTION :

By using Lens formula;

(1/f)=(1/v) + (1/u)

=> 1/f = (1/60) + (1/15)

=> 1/f = (1+4)/60

=> 1/f = 5/60 = 1/12

=> f =12

So, focal length of the lens is 12cm.

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