When does light falling on the border of transparent substances with different optical densities pass

When does light falling on the border of transparent substances with different optical densities pass through it without being refracted?

The fraction of light energy reflected or transmitted through the interface between two media depends on the acoustic impedances of these media. The more the acoustic impedances differ, the more energy will be reflected from the boundary. Accordingly, when the acoustic impedances are equal, the light wave passes from one medium to another without refraction.



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