Question
Question: A convex mirror of focal length 10 *cm* is placed in water. The refractive index of water is 4/3. Wh...
A convex mirror of focal length 10 cm is placed in water. The refractive index of water is 4/3. What will be the focal length of the mirror in water
A
10 cm
B
40/3 cm
C
30/4 cm
D
None of these
Answer
10 cm
Explanation
Solution
No change in focal length, because f depends only upon radius of curvature R.