Question

# A concave mirror is half dipped in water. Focal length of portion of mirror is the air is f1 and focal length of mirror in water is f2, then (Take refractive index of water =43)

A
f1>f2
B
f1<f2
C
f1=f2
D
f143f2
Solution
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#### The focal length of a mirror is function of its radius of curvature and is independent of the medium as it is based on the lows of reflection. So the focal length f, remains same in every medium.

1
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