Question

White light is made up of
A. 1 colour
B. 3 colours
C. 5 colours
D. All existing colours

Answer 1

Hint: The following colours are used to make white light: red, orange, yellow, green, blue, indigo and violet. Each coloured light has a wavelength of its own. Red light has the longest wavelength, and the shortest wavelength is violet light.

Complete solution:
1.The complete blend of all the visible spectrum wavelengths is known as white light. This indicates that if a person has a light beam of all the colours of the rainbow and focuses all of them on a single spot, a beam of white light will result from the combination of all colours.
2.Above the infrared rays, white light or visible light comes in. The Sun emits visible light at its zenith of power. However, all wavelengths are passed by combining the entire emission power spectrum, indicating that the Sun emits slightly more infrared than visible light.
3.A variety of white light sources, both in space and artificial sources on earth, can generate white light.
4. For instance, the sources of white light are the stars and the sun. In the solar system, the obvious source of white light is the Sun.
5.An artificial source of light is the white LED and the fluorescent light bulb that produces white light. The incandescent lamp, however does not produce white light from other light bulbs, but rather produces light within the red to yellow range of a much longer wavelength.
So, The White light is made up of all existing colours

Hence, the correct option is (D).

Note:
All around us is the so-called white light. Most of the light coming from the sky or our home and office light inside enables us to see stuff. Focus is therefore the most important thing that I can think of although it can also be said that heat and energy are provided by life on the planet.