Physics
How does the deviation produced by a triangular prism depend on the colour (or wavelength) of light incident on it?
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Answer
Speed of light in a transparent medium decreases with the decrease in wavelength of light. Therefore, the refractive index of glass (material of prism) increases with the decrease in wavelength of light.
Hence, the deviation produced by a prism also increases with the decrease in the wavelength of light incident on it.
For example — In visible light, violet colour ( wavelength λ = 4000 Å) is deviated the most and red colour (wavelength λ = 8000 Å) is deviated the least.
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