Question

A ray of light takes grazing incidence on the first face of a prism and the emergent ray is normal to the 2nd face of the prism. If D is angle of deviation then the refracting angle of the prism is equal to

• A. 90$^\circ$-2 D
• B. 90$^\circ$-D
• C. 90$^\circ$ $\frac{D}{2}$
• D. 180$^\circ$ - 2D

Answer 1

Answer: (B)

90$^\circ$-D

Answer 2

Answer (b) 90$^\circ$-D