Question

A convex lens (n=1.5) is immersed in water (n=1.33), then it will behave as a -

Answer 1

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Your answer

When immersed in water, the difference between light's speed in the lens and the surrounding medium is less than the difference when it's in air, and the focal length of a lens would be greater under water.

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Answer 2

WHEN REFRACTIVE INDEX DECREASES, THE SPEED OF LIGHT INCREASES.

THEREFORE WHEN SPEED OF LIGHT INCREASES, IT BENDS AWAY FROM THE NORMAL.

WHEN IT BENDS AWAY FROM THE NORMAL, THE LIGHT RAYS DIVERGES.

THUS , IT ACTS AS A DIVERGING LENS ( CONCAVE LENS ).