Question

The band of seven colors that constitute white light is known as
A.Rainbow
B.Palette
C.Spectrum
D.None of the above

Answer 1

Hint: A prism is a transparent optical object with a minimum of two polished plane surfaces inclined relative to each other. Light can either be reflected or refracted by this prism. When the white light is passed through this prism it is spat into seven colors. The seven components of white light are as follows. Violet, indigo, blue, green, yellow, and red which are commonly abbreviated as VIBGYOR.

Complete answer:
The phenomenon of splitting of white light is called dispersion. When this white light passes through this triangular prism a band of seven colors is released. This band of seven colors is said to be a spectrum. The instrument used for observing the spectrum is called the spectroscope. The spectrum can be of two types. One is an emission spectrum and the other one is the absorption spectrum. All the radiation emitted by the atoms or molecules will be contained in an emission spectrum. When a portion of the continuous spectrum is missing it would have been absorbed by the medium. This type of spectrum is often known as the absorption spectrum.

The correct option is C.

Additional Information:
In vacuum different colors of light, rays travel at the same speed. But different colors of light rays travel with varying speeds in different refracting mediums like glass, water, etc. Thus when light passes through this prism the light slows down which is proportional to the wavelength. This causes a rainbow effect. Different colors deviate differently and this difference in deviation causes the light to split into its constituent spectrum.

Note:
When white light is splitted into its component colors while passing through the refractory medium is called light dispersion. This produces a pattern of the colored bands obtained on the screen is called the spectrum. The red color has the least deviated while going through the prism and the violet color is most deviated. Intermediate angles deviate from other colors. Going through a glass prism, various component colors of white light are distributed.