Plzz answer question no 17 and 18 both
17.)Let's first get to the derivation of relationship between wavelength and refractive index.
Refractive index is ration of velocity of light in vacuum to the velocity of light in that medium.
Now we know, that velocity=frequency x wavelength.
Substituting that in equation of refractive index....
Please refer the calculations in the image
Refractive index is ration of velocity of light in vacuum to the velocity of light in that medium.
Now we know, that velocity=frequency x wavelength.
Substituting that in equation of refractive index....
Please refer the calculations in the image