00:02
Hello everybody, here wavelength is equal to lambda a, that is wavelength in air, that is 546 nanometer is given.
00:15
Now refractive index of air that is mu a, this is refractive index of air, that is equal to 1, that we know.
00:26
Now we know that refractive index mu is proportional to 1 by v, is the velocity.
00:32
So we can write mu a by mu water would be equal to v water by v a.
00:42
Now velocity is the product of frequency and wavelength.
00:49
Now frequency of light will not change in water or in air because it is fixed.
00:54
So we can write v a as frequency is same into lambda and v w is frequency same and lambda water.
01:06
Now in this formula here we can put mu a, that is 1 divided by 1 .33, that is the value of mu w, that is the refractive index of water, is equal to frequency into lambda water divided by frequency into lambda air.
01:26
The frequency frequency will get cancelled out, so lambda water by lambda air...