Question

Most ordinary gases do not show dispersion with visible light. Why?

Answer 1

Explanation:

If the two interface surfaces are parallel to each other, as in a 'slab' of glass, all of the bending (and dispersion) that takes place at the first interfaces is exactly reversed at the second, 'undoing' the effect of the first interface; so although the emerging ray of light is displaced slightly from the entering.

Answer 2

Answer:

Dispersion is defined as the separation of light into colors by refraction or diffraction with the formation of a spectrum.

Explanation:

In most ordinary gases, the velocity of propagation of waves of different wavelengths of visible light is almost the same. The waves having a different velocity of propagation than the wavelengths of the visible lights are having the tendency to refract and disperse the light.

For the gases that do not show dispersion with visible light, the refractive index is very close to 1.

Hence, most ordinary gases do not show dispersion with visible light because the velocity of propagation of waves of different wavelengths of visible light is almost the same.

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