Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions

When a ray of light in a denser medium strikes a rarer medium at an angle of incidence i,the angle of reflection and refraction are respectively r and

r'.if the reflected ray and refracted ray are right angles to each other,what is the critical angle for given pair of media?
A)tan inverse (sin i)
B) cot inverse (tan i )
C)sin inverse (tan r')
D)sin inverse(tan r)



This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
If u draw the diagram, u find that when reflected and refracted rays are perpendicular then  i + r = 90 .      r = 90 - i
So Mu = sin i / sin r = sin i / cos i  = tan i
critical angle is  Sin inverse (Mu) = Sin Inverse ( tan i )

1 5 1
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts