Question

Critical angle for light going from medium (1) to (2) is 60⁰. The speed of light in medium (1) is v ; then speed of light in medium (2) is –

• A. v/2
• B. 2v/√3
• C. √3 v
• D. 2v

Answer 1

Answer: (B)

2v/√3

Answer 2

sin i_c = $\frac { \mu _ { 2 } } { \mu _ { 1 } }$= \ sin 60⁰ =

\ v₂ = v/sin 60⁰ = 2v/$\sqrt { 3 }$