Question

a convex mirror of focal length f(in air) is immersed in a liquid (u= 4/3). the focal length of the mirror in liquid will be:
a) 3/4 f
b) 4/3 f
c) f
d) 7/3 f

Answer 1

option B is the answer

Answer 2

Answer:

4/3 f

Explanation:

For spherical mirror if R is radius of curvature, then focal length f=R/2.

Now, R is geometrical factor and it remains the same in air and liquid. So, f does not change.