Question

what us sin i/sinr? in physics?

Answer 1

This is related to Snell's law.
sin i means sin incident angle value
sin r means sin refracted angle value

sin is the trigonometric ratio

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Answer 2

( The second law of refraction )
The ratio of sine of angle of incidence to the sine of angle of refraction is a constant for a light of given colour and for a given pair of media.This law is also called Snell's law of refraction. If 'i' is the angle of incidence and ' r ' is the angle of refraction then,
Sin i/Sin r = constant
this constant value is called the refractive index of the second medium with respect to the first.