Q. 205.0( 3 Votes )

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Answer :

Refraction of light is defined as the bending of light when the light ray passes from one medium to another.


Snell’s law of refraction states that: the ratio of Sine of the angle of incidence to the sine of refraction is constant for a given pair of media. It establishes a relation between angle of incidence and angle of refraction.


It can be expressed mathematically as follows:



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Given: The refractive index of air with respect to glass is = 2/3


Refractive index of water with respect to air = 4/3.


Speed of light in glass = 2x108 m/s


Refractive index of air with respect to glass nag




Va = 2x108 m/s


(ii) Refractive index of water w.r.t air = 4/3


nwa =



On calculating we get velocity of light in water=2.25x108 m/s


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