Question

The critical angle of a prism is $41.8{}^{\circ }$ . What should be the refracting angle of a prism, so that a ray after grazing incidence over one lace emerges grazing over the other face?

• A. $41.8{}^{\circ }$
• B. $83.6{}^{\circ }$
• C. $60{}^{\circ }$
• D. $30{}^{\circ }$

Answer 1

Answer: (B)

Correct answer is (b) $83.6{}^{\circ }$