Question

the principal focus of a convex lens is 15 CM at what distance should the object from the lens be placed so that it forms an image at 10 cm from the lens also find the magnification produced by the lens​

Answer 1

Hello Mate! Here is your answer:

Given,

Principal Focus (f) = 15 cm (positive)

Image Distance (v) = 10 cm (positive)

[These values are positive and negative due to the conventional rule of convex lens]

= 1/f = 1/v-1/u

= 1/u = 1/v-1/f

= 1/u = 1/10-1/15

= 1/u = (3-2)/30

= 1/u = 1/30

= u = 30 cm

Linear Magnification = v/u

= 10/30

= 1/3

= 0.34

The Object Distance should be 30 cm, the Object is virtual in nature and Linear Magnification is 0.34.

I hope this helps.

Answer 2

Explanation:

hope this answer is helpful for you