- Question Answer
- State the law of refraction of light that defines the refractive index of a medium with respect to the other
. State the law of refraction of light that defines the refractive index of a medium with respect to the other
Express it mathematically. How is refractive index of any medium 'A' with respect to a medium 'B' related to the speed of propagation of light in two media A and B? State the name of this constant when one medium is vacuum or air. The refractive indices of glass and water with respect to vacuum are 3f1.and 4/3 respectively. If the speed of light in glass is 2x 108 m/s, find the speed of light in (i)vacuum, (ii) water.
Ans. The second law of refraction gives a relationship between the angle of incidence and the angle of refraction. This
law is also known as Snell's Law of refraction. According to the Snell's law, "The ratio of sine of angle of incident to the sine of refraction is constant for a given pair of media.
sin i/sin r = n constant. This constant is called refractive index.
Example: A ray of light travelling in air enters into glass and gets refracted