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What is critical angle for a material of...

What is critical angle for a material of refractive index `sqrt(2)` ?

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From `sin C = (1)/(mu)=(1)/(sqrt(2)), C = 45^@`.
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PRADEEP-RAY OPTICS-Very Short Answer (b)
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  4. A beam of light is converging towards a certain point. A parallel side...

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  5. What is the basis of an optical fibre ?

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