Q1
What is dispersion?
ASplitting of white light into component colours
BBending of light in one direction only
CAbsorption of all light
DReflection of light only
ICSEClass 10 (ICSE)PhysicsCh 6 · Topic 1
Spectrum
White light splits into a spectrum of colours when passed through a prism, due to different wavelengths refracting by different amounts.
Core concept
Dispersion is the splitting of white light into its component colours (VIBGYOR - violet, indigo, blue, green, yellow, orange, red) by a prism.
How it works
Different colours of light have different wavelengths, causing them to refract by different amounts, with violet bending most and red bending least.
Why it matters
A rainbow forms due to dispersion, refraction, and total internal reflection of sunlight within water droplets in the atmosphere.
Key detail
Understanding the spectrum helps explain natural phenomena like rainbows and is fundamental to understanding the nature of light.
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Quick notes
• Dispersion splits white light into colours.
• Colours: VIBGYOR (violet to red).
• Different wavelengths refract by different amounts.
• Violet bends most; red bends least.
• Rainbows form via dispersion and internal reflection.
• This occurs in atmospheric water droplets.
• Spectrum understanding explains natural phenomena.
• It's fundamental to understanding light's nature.