Concept 9 of 9Foundation
Watch on YouTubeVideoWhite light and rainbow colours
Sunlight LOOKS white but is actually a mix of seven colours. A prism (triangular glass) splits it into:
VIBGYOR — Violet, Indigo, Blue, Green, Yellow, Orange, Red.
Why seven colours? Each colour bends a slightly different amount when refracted. Violet bends most, red bends least. After passing through the prism, they emerge separated.
A rainbow in the sky is nature's prism — tiny raindrops split sunlight. The same VIBGYOR colours appear, with red on the outside and violet inside.
Example
Spray water on a sunny day. Stand with the Sun behind you. You'll see a faint rainbow in the mist.
💡 Tip:The sky is blue because small air molecules scatter blue light more than red. Sunset is red because light travels through more atmosphere, scattering away blues.
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5 questions to check what you just read.
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- Q1.White sunlight is made of:
- Q2.A prism splits white light by:
- Q3.In a rainbow, which colour is OUTERmost?
- Q4.Why is the sky blue?
- Q5.Natural rainbow forms because of: