One day, Ramesh's friend was performing their respective experiments given by their teacher while sitting in the practical lab. Instead of experimenting, Ramesh was playing with his meter scale. Suddenly, he held the scale in his hand and started moving in front of the tube light; then, he observed the seven colours of white light. Sometimes, he got scolded by his lab teacher for not experimenting. Name the phenomenon that leads to forming a band of seven colours.

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Dispersion

Spectrum

Band of colours

None

answer is A.

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Detailed Solution

The phenomenon that leads to forming a band of seven colours is dispersion.
Dispersion of white light is the name of a phenomenon that leads to forming of a band of seven colours. Moreover, Ramesh was not performing the given experiment rather than playing with his meter scale, and he had a lot of curiosity which made him discover the dispersion of light. Here metre scale acts as a prism, where the white light undergoes dispersion and splits into seven colours.
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