State the laws of refraction. What is the meaning of “the refractive

1.	State the laws of refraction. What is the meaning of “the refractive index of crown glass is 1.52”?
Answer» Laws of refraction: 1. The incident ray, the refracted ray and the normal to the interface of two transparent media at the point of incidence, all lie in the same plane. 2. The ratio of the sine of the angle of incidence to the sine of angle of refraction is a constant, for the light of given colour and for the given pair of media. This law is known as snell’s law of refraction. The refractive index of crown glass is 1.52. This means that the ratio of the speed of the light in air and the speed of light in crown glass is equal to 1.52.

State the laws of refraction. What is the meaning of “the refractive index of crown glass is 1.52”?

Answer»

Laws of refraction:

1. The incident ray, the refracted ray and the normal to the interface of two transparent media at the point of incidence, all lie in the same plane.

2. The ratio of the sine of the angle of incidence to the sine of angle of refraction is a constant, for the light of given colour and for the given pair of media. This law is known as snell’s law of refraction.

The refractive index of crown glass is 1.52. This means that the ratio of the speed of the light in air and the speed of light in crown glass is equal to 1.52.

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