What name is given to the ratio of sine of angle of incidence to the sine of angle of refraction?

The ratio of sine of angle of incidence to the sine of angle of refraction is called…… .

Name the constant ratio of the sine of angle of incidence to the sine of angle of refraction.

Fill in the blanks : The ratio of sine of angle of incidence to the sine of angle of refraction is called _____.

What speciality is observed in the value of ratio of sine of the angle of incidence to the sine of the angle of refraction, sin I / sin r ?

For a given pair of media, the ratio of the sine of the angle of incidence to the sine of the anlge of refraction is __

For a given pair of media, the ratio of the sine of the angle of incidence to the sine of the anlge of refraction is __

A ray of light is refracted from medium 1 to medium 2. Show that the ratio of the sine of the angle of incidence and the sine of the angle of refraction is equal to the ratio of velocity of light in medium 1 and that in medium 2.