Question

A prism having an apex angle 4⁰ and refraction index 1.5 is located in front of a vertical plane mirror as shown in figure. Through what total angle is the ray deviated after reflection from the mirror

• A. 176⁰
• B. 4⁰
• C. 178⁰
• D. 2⁰

Answer 1

Answer: (C)

178⁰

Answer 2

$\delta _ { \text {Pr ism } } = ( \mu - 1 ) A = ( 1.5 - 1 ) 4 ^ { o } = 2 ^ { \circ }$

$\therefore$ $\delta _ { \text {Total } } = \delta _ { \text {Pr ism } } + \delta _ { \text {Mirror } }$