Define refraction and state the laws of refraction.

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#### Solution

The phenomenon of change in the direction of propagation of light when it passes obliquely from one transparent medium to another is called refraction of light.

**Laws of refraction:-**

- The incident ray and the refracted ray are on the opposite sides of the normal at the point of incidence, and all three lie in the same plane.
- For a given pair of media, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant.

`sin i/sin r=mu`

This constant is called the refractive index of the second medium with respect to the first medium.

Concept: Refraction of Light Through a Rectangular Glass Slab

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