    Question

# In the figure, a light ray is incident on the lower medium boundary at an angle of 45 the normal. Which of the following statements are true? A
If μ2>2, then angle of deviation is 45
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B
If μ2<2, then angle of deviation is 90
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C
If μ2<2, then angle of deviation is 135
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D
If μ2>2 , then angle of deviation is 00
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Solution

## The correct options are A If μ2>√2, then angle of deviation is 45∘ B If μ2<√2, then angle of deviation is 90∘There will be two conditions possible for the given situation For the first condition where total internal reflection will not take place, μ2>√2 From the figure, Applying Snell’s law μ1sini=μ2sinr Hence, 2sin45∘=μ2sinr …… (1) Similarly, μ2sinr=μ3sine ∴μ2sinr=√2sine …… (2) From the equation (1) and (20 2sin45∘=√2sine sine=1⇒e=90∘ Therefore the deviation will be 45∘ Now for the second condition that the total internal reflection will not take place μ2<√2 Hence for this condition, it can be seen from the figure The deviation will be 90∘ The correct answer is option (A) and (B).   Suggest Corrections  0      Similar questions  Related Videos   Playing with Refractive Index
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