. (a) Compare the speeds of light of wavelength 4000
(a) Compare the speeds of light of wavelength 4000
(i.e. violet light) and 8000
(i.e. red light) in vacuum.
(b) How is the refractive index of a medium related to the speed of light in it and in vacuum or air?
(a) Speed of light depends on medium not on wavelength hence speed will be same for both.
(b) Denser medium has a higher refractive index and therefore the speed of light in such medium is lower in comparison to the speed of light in a medium which has a lower refractive index.