Question

No refractive occurs at the boundary that separates two media of equal refractive indices. Why??​

Answer 1

In passing through a boundary refraction will not take place if,
(i) light is incident normally on the boundary.
(ii) the indices of refraction of the two media rare same.
(iii) the boundary is not visible.
(iv) the angle of incidence exceeds the critical angle.

Answer 2

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When light travels from one medium to another, it generally bends, or refracts. Unlike reflection, refraction also depends on the media through which the light rays are travelling. This dependence is made explicit in Snell's Law via refractive indices, numbers which are constant for given media1.