Question

Velocity of electromagnetic waves........in a denser medium

Answer 1

Its velocity in a medium is determined by the electromagnetic (e.g. dielectric) properties of the medium. Effective path length on the other hand is increased by an increase in the density and hence it leads to higher refractive index and lower velocity.

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Answer 2

reduces

Explanation:

Velocity of electromagnetic waves in an optically denser medium reduces.

Upon entering an optically denser medium the wave bends at the interface of the two medium. If the light enters a denser medium from a rarer medium at an angle which is not parallel to the normal to the interface then it bends towards the normal, contrarily when it enters into a rarer medium form a denser medium it bends away from the normal of the interface.

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TOPIC: refractive index

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