Question

Question 2
For a symmetric prism made of material of refractive index n. what should be the angle of prism so that there
is no emergent ray whatever be the angle of incidence?
x​

Answer 1

Explanation:

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Answer 2

Explanation:

If the ray just emerges from face AC, <br>

and

(i) <br> From Snell's law at face AB, we have <br>

(ii) <br>

(iii) <br> From Eq. (ii), n is minimum when

is maximum, i.e.,

. In this case,

<br> From Equ. (iii), <br>

or

<br> As

<br>