Dispersion of Light and Spectrum

It is desired to make an achromatic combination of two lenses $(L_1 \& L_2)$ ${\omega }_1$ and ${\omega }_2 (<{\omega }_1)$. If the combination of lenses is converging then

Which one of the following spherical lenses does not exhibit dispersion? The radii of curvature of the surfaces of the lenses are as given in the diagrams.

Which one of the following spherical lenses does not exhibit dispersion? The radii of curvature of the surfaces of the lenses are as given in the diagrams.

Refractive index of a transparent material is

What is the significance of the dispersion of light into its spectrum of colours.

 What are the Applications of Emission and Absorption Spectra

How many types of emission spectrum.

What is a line spectrum$?$ How it differs from band spectrum.

What causes the emission spectra to appear.

For absorption and emission spectra of atoms which one of the following particle changes energy levels

1. Alpha
2. Electron
3. Neutron
4. Photon
5. Proton

Comparison between Line Spectrum and Band Spectrum

What is the identity of the absorption spectra?

How is an absorption spectrum produced

What is absorption spectrum in plants.

What causes absorption lines in a spectrum?

Rainbow appears due to dispersion of sunlight by

Angle of dispersion depends on:

Dispersive power of the material of a prism is $0.0221.$ If the deviation produced by it for yellow colour is $38°$, then the angular dispersion between red and violet colours is

A prism whose angular dispersion is ${30}^{\circ }$ Deviates light by ${60}^{°}$. The dispersive power of the prism is:

In producing a pure spectrum, the incident light is passed through a narrow slit placed in the focal plane of an achromatic lens because a narrow slit