what is refractive index n how it is to be calculates ??  If it is said that refractive index of air with respect to water is ,,,,,,,. wht does it mean??

Asked by Nancy | 29th Jan, 2017, 09:15: AM

Expert Answer:

The extent of the change in the direction of a light ray that takes place in a given pair of media is expressed in terms of the refractive index.
Light travels fastest in vacuum and also with almost the same speed in air. In other media, its speed is relatively less. The value of the refractive index for a given pair of media depends on the speed of light in the two media.
The refractive index of medium 2 with respect to medium 1 is given as
Similarly, the refractive index of medium 1 with respect to medium 2 is
When we say that the refractive index of air wrt to water, we mean that the ratio of speed of light in air to the speed of light in water is 'x' (value you get after calculation)

Answered by Yashvanti Jain | 30th Jan, 2017, 01:01: PM