Q. Consider the following statements about refraction of light :
- The incident ray, refracted ray and the normal ray lie in the same plane.
- The angle of incidence is equal to the angle of refraction.
Which of the above is / are correct?
Answer:
Only 1
Notes: The laws of refraction of light are:
- 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.
- The ratio of sine of angle of incidence to the sine of angle of refraction is constant, for the light of a given colour and for the given pair of media.
This law is also known as Snell's law of refraction. (This is true for angle 0 < i < 90) If i is the angle of incidence and r is the angle of refraction, then, sin i/ sin r = constant.