Question

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Solution

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Correct option is A)

The incident angle will be $90−i$

$3 sin(90−i)=2 sinr$

$3 cosi=2 sinr$

Now, for the interface CD,

$2 sin(90−r)=sini$

Thus, $2 cosr=sini$

We have two equations in i and r, squaring and adding these 2,

we get,

$2cos_{2}i+1=2$

$2cos_{2}i+1=2$

This gives, $cosi=2 1 $

Thus, $i=45$

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