Question

plzz answer the following in the attachment............​

Answer 1

Answer:

==>> A light ray is refracted when it passes from one medium to another at an angle and its speed changes. Because different wavelengths of light trawls through a medium at different speeds, the amount of bending is different for different wavelengths.

• ===>> When light passes through a glass, it encounters two surfaces- one entering and the other leaving. It slows down at first interface and speeds back up at the second. If the two interface surfaces are parallel as in the case of rectangular glass slab, all of the bendings that took place at the first interface 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 ray and all wavelengths that separated interface are recombined.
• ===>>>But in the case of a prism, the two surfaces are not parallel. So the effect of the first interface is not reversed and the colours separated at the interface continue along different paths, upon leaving the glass.

Explanation:

dispersion :-

==>> Upon passage through the prism, the white light is separated into its component colors - red, orange, yellow, green, blue and violet. The separation of visible light into its different colors is known as dispersion.

• In the Light and Color unit of The Physics Classroom Tutorial, the visible light spectrum was introduced and discussed. Visible light, also known as white light, consists of a collection of component colors. These colors are often observed as light passes through a triangular prism. Upon passage through the prism, the white light is separated into its component colors - red, orange, yellow, green, blue and violet. The separation of visible light into its different colors is known as dispersion. It was mentioned in the Light and Color unit that each color is characteristic of a distinct wave frequency; and different frequencies of light waves will bend varying amounts upon passage through a prism. In this unit, we will investigate the dispersion of light in more detail, pondering the reasons why different frequencies of light bend or refract different amounts when passing through the prism.

• Earlier in this unit, the concept of optical density was introduced. Different materials are distinguished from each other by their different optical densities. The optical density is simply a measure of the tendency of a material to slow down light as it travels through it. As mentioned earlier, a light wave traveling through a transparent material interacts with the atoms of that material. When a light wave impinges upon an atom of the material, it is absorbed by that atom. The absorbed energy causes the electrons in the atom to vibrate. If the frequency of the light wave does not match the resonance frequency of the vibrating electrons, then the light will be reemitted by the atom at the same frequency at which it impinged upon it. The light wave then travels through the interatomic vacuum towards the next atom of the material. Once it impinges upon the next atom, the process of absorption and re-emission is repeated.

Answer 2

Explanation:

A light ray is refracted when it passes from one medium to another at an angle and its speed changes. Because different wavelengths of light trawls through a medium at different speeds, the amount of bending is different for different wavelengths.

When light passes through a glass, it encounters two surfaces- one entering and the other leaving. It slows down at first interface and speeds back up at the second. If the two interface surfaces are parallel as in the case of rectangular glass slab, all of the bendings that took place at the first interface 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 ray and all wavelengths that separated interface are recombined.

But in the case of a prism, the two surfaces are not parallel. So the effect of the first interface is not reversed and the colours separated at the interface continue along different paths, upon leaving the glass.

I hope this will helps you !!!❤️