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Question

What is the equation for finding the critical angle?

A
sinθc = n2/n1
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B
sinθc = n1/n2
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C
sinθc = 1/n2
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D
sinθc = 1/n1
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Solution

The correct option is A sinθc = n2/n1
Here critical angle is expressed as θ and equation for finding the critical angle is the ratio of refractive index of 2nd medium to the refractive index of 1st medium
sinθc = n2/n1

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