Question

What is the line called which is always perpendicular to it’s interface ?

Answer 1

it is called normal.

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Answer 2

Answer:

The ray of light which travels into the refracted, or second, medium and leaves the interface is called the reflected ray. A line perpendicular to the surface is imagined at the point of refraction. This line is called a normal. In this context the word normal means perpendicular.

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