Question

A ray of light when incident upon a prism suffers a minimum deviation of 39⁰. If the shaded half portion of the prism is removed, then the same ray will -

• A. Suffer a deviation of 19.5⁰
• B. Suffer a deviation of 39⁰
• C. Not suffer any deviation
• D. Will be totally internally reflected

Answer 1

Answer: (A)

Suffer a deviation of 19.5⁰

Answer 2

d = (µ – 1) A

d µ A

\ $\frac { \delta _ { 2 } } { \delta _ { 1 } } = \frac { \mathrm { A } _ { 2 } } { \mathrm {~A} _ { 1 } }$

\ $\frac { \delta _ { 2 } } { \delta _ { 1 } } = \frac { \mathrm { A } / 2 } { \mathrm {~A} }$= $\frac { 1 } { 2 }$

\ d₂ = $\frac { \delta _ { 1 } } { 2 }$

d₂ = $\frac { 39 } { 2 }$= 19.5⁰