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The incident angle will be 90−i

√3sin(90−i)=√2sinr

√3cosi=√2sinr

Now, for the interface CD,

√2sin(90−r)=sini

Thus, √2cosr=sini

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

we get,

2cos2i+1=2

2cos2i+1=2

This gives, cos i=1√2

Thus, i=45

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