# State the laws of refraction of light. If the speed of light in vacuum is 3 × 108 ms−1, find the speed of light in a medium of absolute refractive index 1.5.

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i) The incident ray, refracted ray and the normal to the interface of two transparent media at the point of incidence, all lie in the same plane

ii) the ratio of sine of angle of incidence to the sine of angle of refraction is a constant , for the light of a given colour and for the given pair of media

=

= 3* 10^8/1.5=2* 10^8m/s

therefore the speed of light in the given medium is 2* 10^8 m/s