Question

When light ray changes its medium its velocity is
a) Increased
(b) Decreased
c) Changed
d)Remain constant
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Answer 1

Answer:

Changed.

It depends on the medium that whether the medium is dense or rare.

If light enters in a denser medium than velocity will slow down and if it enters in rarer medium it's velocity will increase.

Since what kind of medium is not mentioned in the question so velocity is simply changed..