TOPIC :RAY AND WAVE OPTICS
Number of questions are 595, Select_Question:

QUESTION
Q1) If the critical angle for total internal reflection from a medium to vacuum is 30°. Then velocity of light in the medium is ---{AFMC 1997]




SOLUTION

µ=1 / sin c
µ=1/ sin30
µ=2
µ=velocity of light in vacuum / velocity of light in medium
Velocity of light in medium=velocity of light in vacuum / µ
Velocity of light in medium=3×108 / 2=1.5×108
Answer: (a)