(a) Snell's law of refraction states that :
(i) The ratio of sine of angle of incidence to the sine of angle of refraction is a constant;
𝐬𝐢𝐧 𝐢/𝐬𝐢𝐧 𝐫 =𝛍
(ii) The incident ray, the refracted ray and the normal to the interface of two transparent media at the point of incidence, all lie in the same plane.
(b) The following diagram shows the refraction of the light through a glass slab:
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(a) State snell’sScience - Board Papers