Question

State two conditions under which the path of a ray of light will deviate?

Answer 1

Answer:

Fermat's principle of least time tells us that light always takes the path which is extreme in nature (i.e. minimum, maximum or constant). When the velocity of light changes it has to change its direction accordingly to arrive in the same phase.

Explanation:

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Answer 2

Answer:

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Explanation:

There is only one condition when a ray of light entering a medium from a different medium will not deviate, when the ray is incident on the interface separating the two medium normally to the interface ie when the angle of incidence is zero. In this case there is no deviation from the original path.