The speed of propagation of light wave in a dispersive medium does NOT depend on the:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → intensity of light
The speed of light in a medium is \( v = c/n \), where n is the refractive index of the medium. In a dispersive medium n is different for different colours, so n, and with it v, depends on the frequency (wavelength) of the light.
The intensity of the light is different: for ordinary light intensities n does not change with the brightness of the beam, so the speed is independent of intensity.