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प्रश्न
Is the critical angle for a given interface greater for red light or for blue light?
अति संक्षिप्त उत्तर
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उत्तर
The critical angle for a given interface is greater for red light because the refractive index for red light is less than that for blue light. Since critical angle increases as refractive index decreases, it is greater for red light.
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