alleryThe splitting of white light by a prism into colours is due to:
ADifferent intensities of colours
BDifferent speeds of colours in the glass
CReflection from the prism
DAbsorption inside the prism
Answer & Solution
Correct answer: B. Different speeds of colours in the glass
1. White light contains many wavelengths.
2. The refractive index of glass depends on wavelength.
3. Shorter wavelengths travel slower and bend more in the prism.
4. Longer wavelengths bend less, so colours separate.
5. This wavelength-dependent speed produces dispersion.
6. So the cause is different speeds (and hence indices) for different colours.
_Source: syllabus Science Ch 11 'Human Eye and the Colourful World'_
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