Question

What is recombination of white light?

Answer 1

Recombination of white light. The recombination of white light is defined as white light being dispersed in to seven different colours and gained back with its originality.

The splitting of white light into its constituent colours is called dispersion. When light passes through a prism, it deviates.

The angle of deviation depends on the angle of incidence, the angle of the prism, the colour of the light, and on the material of the prism, i.e. on the refractive index of the material of the prism. When white light passes through a prism, a band of seven colours is obtained, which is called the spectrum. The seven colours in the spectrum are violet, indigo, blue, green, yellow, orange and red.

A spectrum is produced because lights of different colours are refracted through different angles when they pass through a prism.

A rainbow is formed by the dispersion of light by water drops in the atmosphere. A rainbow is always formed in the direction opposite to that of the sun. When light enters a water droplet, it is first refracted and dispersed into its constituent colours, then gets totally internally reflected at the water-air interface, and emerges from the water drop, thus forming a rainbow.

Sir Isaac Newton was the first to use a glass prism to obtain the spectrum of sunlight. Newton split the colours of the spectrum of white light further by using another similar

prism. But he could not get any more colours. He then placed a second identical prism in an inverted position with respect to the prism,

This allowed all the colours of the spectrum to pass through the second prism. He found a beam of white light emerging from the other side of the second prism. This observation gave Newton the idea that the sunlight is made up of seven colours. Any light that gives a spectrum similar to that of sunlight is often referred to as white light.

Answer 2

Answer:

Recombination of white light

• The recombination of white light is defined as white light being dispersed in to seven different colours and gained back with its originality.
• The white light is made to disperse in to different light by keeping the prism in the path of white light beam, this dispersed light is further passed to inverted prism which recombines the seven dispersed light in to single beam.
• Hence the white light is regained back. This process is called as recombination form of white light.