Which among the below set of colours are generally known as the primary colours of light?

Question

Question

This question was previously asked in

NTPC CBT 2 2016 Previous Paper 5 (Held On: 18 Jan 2017 Shift 2)

Answer 1

The correct answer is Red, Green, Blue.

Red, green, and blue are the primary colours of light—they can be combined in different proportions to make all other colors.
There are two colour models:
- Light Color Primaries (Red, Green, Blue).
- Pigment Color Primaries (Cyan, Magenta, Yellow).

Important Points

Primary colours make all other colours:
- Red + Green = Yellow.
- Green + Blue = Cyan.
- Blue + Red = Magenta.
There are three Secondary Colors (S'): Orange, Green, Violet.
There are six Tertiary Colors (Ts): Red-Orange, Yellow-Orange, Yellow-Green, Blue-Green, Blue-Violet, Red-Violet.
- Tertiary is formed by mixing a primary with a secondary.

Additional Information

In terms of wavelengths, visible light ranges from about 400 nm to 700 nm.
light with a wavelength of about 400 nm is seen as violet, and light with a wavelength of about 700 nm is seen as red.

Key Points

The inner surfaces of human eyes contain photoreceptors—specialized cells that are sensitive to light and relay messages to the brain.
- There are two types of photoreceptors: cones (which are sensitive to colour) and rods (which are more sensitive to intensity).
- Humans are able to see an object when light from the object and enters their eyes and strikes these photoreceptors.