Q47 / 237 · NTA Abhyas (NEET) 2020 · Physics · Ray Optics

The deviation produced by a prism is

A
same for all wavelengths
B
greatest for red and least for violet
Correct answer
C
greatest for violet and least for red
D
the prism produces no deviation

Solution

Deviation is given by,

δ = A (μ - 1)

Also, refractive index

μ \propto \frac{1}{λ}

As

λ_{R} > λ_{ν}

∴ μ_{R} < μ_{ν}

∴ δ_{R} < δ_{ν}

Hence, the correct answer is option: 'C'.

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