Q.

Material I has critical angle iA and material B has critical angle iB(iB>iA) Then which of the following is true(i) Light can be totally internally reflected when it passes from,B to A(ii) Light can be totally internally reflected when it passes from A to B(iii) Critical angle for total internal reflection is iB-iA(iv) Critical angle between A and B is sin−1sin iAsin iB

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a

(i) and (iii)

b

(i) and (iv)

c

(ii) and (iii)

d

(ii) and (iv)

answer is D.

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Detailed Solution

We know C=sin−11μGiven critical angle iB>iASo μB<μA i.e., B is rare and A is denser.Hence light can be totally internally reflected when it passes from A to,BNow critical angle for, A to B
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Material I has critical angle iA and material B has critical angle iB(iB>iA) Then which of the following is true(i) Light can be totally internally reflected when it passes from,B to A(ii) Light can be totally internally reflected when it passes from A to B(iii) Critical angle for total internal reflection is iB-iA(iv) Critical angle between A and B is sin−1sin iAsin iB