Complete the above given questions
Answers
Answer:
(a) The dispersion of white light refers to its separation into different colour components. White light or visible light consists of the colours red, orange, violet, green, blue and yellow. This phenomenon can occur when white light travels through a glass prism. The white light that enters the prism is refracted at different angles, causing the separation of this light into the different colours. Each of these colours has a different wavelength. As the degree of refraction increases, the wavelength decreases. A shorter wavelength means that light bends more than at a longer wavelength. Red and orange light exhibits longer wavelengths, while blue or violet light has shorter ones. This results in forming a spectrum of seven colours while dispersion.
Explanation:
(b) Angle of Deviation is defined as the angle between the incident and the emergent ray.
As the light enters the first refracting surface of the prism it gets refracted and is incident at the second refracting surface and emerges out at an angle of emergence from the prism. The angle of deviation of is the angle of diversion which is produced in the path of the incident light ray striking at the prism.
(i) Emergent ray bends at an angle to the direction of the incident ray and the angle between them is known as angle of deviation.
(ii) When a beam of light enters a prism, it gets refracted and splits into its seven constituent colours. This splitting of the light ray occurs because of the different angles of bending of each colour. Hence, each colour passing through the prism bends at different angles with the respect to the incident beam.