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Laws of Refraction #8211; (i) When light goes from one medium to another, the frequency and phase of light do not change, however velocity and wavelength of light changes, (ii) The incident ray, the refracted ray and normal to the interface at point of incidence, all lie in the same plane, (iii) The product of refractive index and sine of angle of incidence/refraction at a point in a medium is constant i.e. μ times; sin i = constant
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