Question

A ray of light is coming from air to water.
Which of the following figure shows disper-
sion of light?
And what is v and r here????​

Answer 1

Hence, the angle of refraction will be smaller than the angle of incidence.

solution

Explanation:

The diagram below shows a light ray undergoing refraction as it passes from air into water. The incident ray is a ray (drawn perpendicular to the wavefronts) that shows the direction that light travels as it approaches the boundary. Similarly, the refracted ray is a ray (drawn perpendicular to the wavefronts) that shows the direction that light travels after it has crossed over the boundary. In the diagram, a normal line is drawn to the surface at the point of incidence. This line is always drawn perpendicular to the boundary. The angle that the incident ray makes with the normal line is referred to as the angle of incidence. Similarly, the angle that the refracted ray makes with the normal line is referred to as the angle of refraction.

The cause of refraction is a change in light speed; and wherever the light speed changes most, the refraction is greatest. The speed is related to the optical density of a material that is related to the index of refraction of a material. Air is the least dense material (lowest index of refraction value) and water is the denser material (largest index of refraction value). Thus, it would be reasonable that the most refraction occurs for the transmission of light across an air-water boundary.

Answer 2

Answer:

Figure (2) shows the dispersion of light.

Explanation:

• When light travels from one medium to other, it is split into its component colors.
• This happens because the angle of refraction of different colors is different.
• Among the component colors, the red light is deviated the least and hence is at the upper part of the spectrum.
• The violet light is deviated the most and is at the lower part of the spectrum.
• The V and R are abbreviations for violet and red colors.

Therefore, figure (2) shows the dispersion of light when a ray is coming from air to water and the V and R represent the colors violet and red.

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