Question

When an object is placed at a distance of from a spherical mirror, the magnification is . When the object is moved away from mirror with respect to the earlier position, then magnification becomes . If , then the focal length of the mirror is :

A

B

C

D

Medium
Solution
verified
Verified by Toppr
Correct option is D)

From the formula,

Magnification

From the question, 

For first case, object distance

After the object is moved 15 cm away from the mirror, new object distance becomes  

 

Or  

Or  


Was this answer helpful?
upvote 0
downvote0