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Question

On a right angled prism, the rays A, B and C are incident, as shown in the figure. Before emerging from the prism, which ray or rays will experience total internal reflection ?
1246118_a24566ea2805489ca11464f6ce24cb4b.png

A
A
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B
B
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C
C
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D
none of these
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Solution

The correct option is B B
from the tig. we see that the angle of inodence of ray B is equal to zero. Let us redraw the diagram for ray B .
As ray is 11/2 to surface pR it goes undented, 9n surfare pQ it makes 45 with respect to normal of PQ . Now, it reflect to surface QR , esimilarly, it will get totally reflected.
Hence, Ray (B) experience total internal reflection (B) is correct ophion.

2001254_1246118_ans_5db3c44b31b942f38a96f8c16b0bd051.PNG

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