Question

Name the color/s of the spectrum of white light which has a wavelength longer than blue light.
(A) Green
(B) Yellow
(C) Red
(D) All of the above

Answer 1

Hint: White light consists of all the seven colors of the rainbow. This means white light is the mixture of all the wavelengths of seven colors. White light incident on the refracting face of the prism then each color ray deviates with a different angle which depends on the wavelength of color.

Complete step-by-step answer:
When white light passes through the spectrum it gets split into 7 lights violet, indigo, blue, green, yellow, orange, red (VIBGYOR). The light which gets least deviated has the longest wavelength and the one which gets deviated the most will have the least wavelength among them. Therefore, moving from violet light to red light wavelength increases.
The increasing order of the wavelength is as follows:
Violet $<$ indigo $<$ blue $<$ green $<$ yellow $<$ orange $<$ red
From the order above we can say that the colors of the spectrum of light that have wavelengths longer than blue light are Green, Yellow, and Red.
Also, blue light gets deviated more than yellow, red, green, and orange, hence it has a wavelength less than these lights.
Hence, the option (D) is the correct option.

Additional information:
1. The electromagnetic spectrum is the full range of all frequencies of electromagnetic radiation.
2. The visible spectrum is the part of the electromagnetic spectrum which can be seen by the human eye.

Note:
Dispersion causes the separation of white light into components of different wavelengths.
The wavelength of visible light ranges from 390 nm to 700 nm. Light from many different sources contains various colors (each with its brightness or intensity).