Question

What happens to the focal length of a convex mirror if it is immersed in water?

Answer 1

When a lens is immersed in water it's refractive index decreases, therefore it's focal length increases..

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Answer 2

It happens to the focal length of the convex mirror , a car is moving with a constant velocity of of 10 metre per second and a constant force applied on it for four second and begin to move in opposite direction with speed of 2 metre per second by the acceleration produced...