Question

what is meant refraction of light ?write its principle​

Answer 1

Refraction is the bending of a wave when it enters a medium where its speed is different. The refraction of light when it passes from a fast medium to a slow medium bends the light ray toward the normal to the boundary between the two media. ... The bending of refraction can be visualized in terms of Huygen's principle.

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Answer 2

Bending of light from one median to the other is called refraction of light.

When a light ray falls obliquely on the surface, it enters from an rarer medium to denser medium the light ray moves towards the normal.

When a light ray moves from denser medium to rarer medium it moves away from the normal.

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