STANDARD Physics Dispersion MCQ Question
A short pulse of white light is incident from air to a glass slab at normal incidence. After travelling through the slab, the first colour to emerge is
blue
green
violet
red
Correct Answer
Detailed Explanation
Since λᵣ > λᵍ > λᵦ > λᵥ, then μᵣ < μᵍ < μᵦ < μᵥ (μ = a + b/λ²). Red light, having the longest wavelength, emerges first.
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