Question

a converging lens has focal length of 12 CM . calculate at what distance should the object be placed from the lens so that it forms an image at 48 CM on the other side of the lens ? please give the answer please please please please

Answer 1

f=12cm. v=48cm. u=?
by lens formula i.e. 1/f=1/v - 1/u
1/12 = 1/48 - 1/u
1/u = 1/48 - 1/12
1/u = 1-4/48
1/u = -3/48
1/u = -1/16
u = -16cm

Answer 2

Answer:

Explanation:

Given :-

Focal length of converging lens, f = 12 cm

Image distance, v = 48 cm

To Find :-

Object distance, u = ??

Solution :-

Using lens formula, we get

1/f = 1/v - 1/u

1/u = 1/v - 1/f

⇒ 1/u = 1/48 - 1/12

⇒ 1/u = 1 - 4/48

⇒ 1/u = - 3/48

⇒ u = - 48/3

⇒ u = - 16 cm

Hence, the distance of the object from the lens is 16 cm.