Question

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) 40/3 cm
B) 10 cm
C)None of these
D)30/4 cm​

Answer 1

Answer:

30/4

Explanation:

focal length of convex mirror =10cm=F

refractive index (u)=4/3

focal length In water =F/u

=(10×3)/4

=30/4cm

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