Question

What is the first law of refraction?

Answer 1

Answer:

Refraction of light is the change in direction (bending of light rays) when it passes from one optically transparent medium to another. ... First law of refraction states that the incident ray, the refracted ray and the normal to the interface all lie in the same plane.

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Answer 2

The two laws of refraction are:

first law: The incident ray, the refracted ray,the normal at the point of incidence all lie in the same plane.

second law : The ratio of the sine of angle of incidence to the sine of angle of refraction is constant, i.e,

$sin(i) \div \sin(r) = constant$