Question

laws of refraction .........................

Answer 1

At the point of incidence where the ray strikes the mirror, a line can be drawn perpendicular to the surface of the mirror. This line is known as a normal line . The normal line divides the angle between the incident ray and the reflected ray into two equal angles.

Answer 2

1) the incident ray the refracted Ray and the normal to the interference of a two transparent medium at the point of incidence all lies in the same plane
2) the ratio of a sine of angle of incidence to the Sine of angle of refraction is constant for the light of a given colour and for the pair of a medium this is also known as Snell's law of refraction

is the angle of incidence and the angle of refraction then
sin I/ sinR = to constant

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