Free help with homework

Why join Brainly?

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

The absolute refractive indices of glass and water are 4/3 and 3/2 respectively.If the speed of light in glass is 2X10^8 m/s, calculate the speed of light



Speed of light changes according to the medium it is in.
in vacuum, speed of light is always  3x10^8 ms^ -1
formula required here is n= c/v 
where n is refractive index
c is speed of light in vacuum,
v is speed of light in medium.
substitute the values n find the answer.
0 0 0

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.
I hope you have given the data of refractive indexes correctly.  Normally water has 4/3 and  glass = 3/2.  You have given the other way round.

\mu_g=4/3,\ \ \ \mu_w=3/2\\\\c_{gl}=2*10^8m/s,\ \ \ c_w=?,\ c=?\\\\\mu_g=\frac{c}{c_{g}}\\\\In\ vacuum\ c=\mu_g*c_g=\frac{4}{3}*2*10^8=2.667*10^8 m/s\\\\c_w=\frac{c}{\mu_w}=\frac{2.667*10^8}{3/2}=1.778*10^8m/s

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