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The variation of refractive index of a crown glass thin prism with wavelength of the incident light is shown. Which of the following graphs is the correct one, if D m is the angle of minimum deviation? 1.535 1.530 1.525 1.520 1.515 1.510 n 2 λ (nm) 400 500 600 700

1. D m λ (nm) 400 500 600 700
2. D m λ (nm) 400 500 600 700
3. D m λ (nm) 400 500 600 700
4. D m λ (nm) 400 500 600 700

Correct answer: D m λ (nm) 400 500 600 700

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