Question

How many colours are there in a Rainbow ?

• A. 7
• B. 5
• C. 6
• D. 4

Hint:

Remember the acronym VIBGYOR (Violet, Indigo, Blue, Green, Yellow, Orange, Red) to easily recall the seven colours of the rainbow in order of increasing wavelength.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept
The question asks for the number of colours traditionally identified in a rainbow.
Step 2: Detailed Explanation
A rainbow is a meteorological phenomenon that is caused by reflection, refraction, and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky.
Although the colour spectrum is continuous, it is traditionally divided into seven distinct colours.
These seven colours are Red, Orange, Yellow, Green, Blue, Indigo, and Violet. This is often remembered by the acronym VIBGYOR (from bottom to top) or ROY G. BIV (from top to bottom).
Step 3: Final Answer
Thus, there are 7 colours in a rainbow.