Question

What will be the angel of refraction for the light ray incident normal at the surface ?

Page 45 Chapter - 2.Reflection and Refraction

Answer 1

it will be zero and it will not reflect

Answer 2

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As previously mentioned, in this case light rays are bent away from the normal of the interface between the media. At what is called the critical angle of incidence (Θ), the refracted rays make an angle of 90° with the normal—in other words, they just skim the boundary of the two media.