Question

A concave mirror of raidus 30cm is placed in
water. its focal length
in air & Water
differ by:-
0
30
15
20​

Answer 1

Answer:

15

Explanation: The focal length in air and water differ by 15 cm.

As we know that the focal length is half of the radius of curvature. Thus, the focal length in air and water differ by 15 cm.

Answer 2

Answer:

this is the answer = is 20 can