Dispersion and Spectra Physics - Dispersion and Spectra

Consider the following two statements:

1. Line spectra contain information about atoms.
2. Band spectra contain information about molecules.

1. Both A and B are wrong
2. A is correct but B is wrong.
3. B is correct but A is wrong
4. Both A and B are correct.

Which of the following quantities increase when wavelength is increased? Consider only the magnitudes.

1. The power of a converging lens.
2. The focal length of a converging lens.
3. The power of a diverging lens.
4. The focal length of a diverging lens.

Which of the following quantities related to a lens depend on the wavelength or wavelengths of the incident light?

1. Power.
2. Focal length.
3. Chromatic aberration.
4. Radii of curvature.

By properly combining two prisms made of different materials, it is possible to:

1. Have dispersion without average deviation.
2. Have deviation without dispersion.
3. Have both dispersion and average deviation.
4. Have neither dispersion nor average deviation.

If a glass prism is dipped in water, its dispersive power:

1. Increases.
2. Decreases.
3. Does not change.
4. May increase or decrease depending on whether the angle of the prism is less than or greater than 60°.

If three identical prisms are combined, is it possible to pass a beam that emerges undeviated? Undispersed?

"Monochromatic light should be used to produce pure spectrum". Comment on this statement.

Suggest a method to produce a rainbow in your house.

The minimum deviations suffered by red, yellow and violet beams passing through an equilateral transparent prism are 38.4°, 38.7° and 39.2° respectively. Calculate the dispersive power of the medium.

A thin prism is made of a material having refractive indices 1.61 and 1.65 for red and violet light. The dispersive power of the material is 0.07. It is found that a beam of yellow light passing through the prism suffers a minimum deviation of 4.0° in favourable conditions. Calculate the angle of the prism.

Two prisms of identical geometrical shape are combined with their refracting angles oppositely directed. The materials of the prisms have refractive indices 1.52 and 1.62 for violet light. A violet ray is deviated by 1.0° when passes symmetrically through this combination. What is the angle of the prisms?

A certain material has refractive indices 1.56, 1.60 and 1.68 for red, yellow and violet light respectively.

1. Calculate the dispersive power.
2. Find the angular dispersion produced by a thin prism of angle 6° made of this material.

A flint glass prism and a crown glass prism are to be combined in such a way that the deviation of the mean ray is zero. The refractive index of flint and crown glasses for the mean ray are 1.620 and 1.518 respectively. If the refracting angle of the flint prism is 6.0°, what would be the refracting angle of the crown prism?

The refractive index of a material M₁ changes by 0.014 and that of another material M₂ changes by 0.024 as the colour of the light is changed from red to violet. Two thin prisms one made of M₁(A = 5.3°) and other made of M₂(A = 3.7°) are combined with their refracting angles oppositely directed.

1. Find the angular dispersion produced by the combination.
2. The prisms are now combined with their refracting angles similarly directed. Find the angular dispersion produced by the combination.