1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Spherical glass object with index of refraction N

  1. Nov 15, 2005 #1
    imagine there is a spherical glass object with index of refraction N
    is that possible that for some N and angle of incidence A, the light will be total internal reflected forever. In other word, the light will travel within the object forever?
    i have been trying to proof it. but i dont know much about optic.... so no where to start at
     
    Last edited: Nov 15, 2005
  2. jcsd
  3. Nov 15, 2005 #2

    russ_watters

    User Avatar

    Staff: Mentor

    What you are describing is the operating principle behind fiber optic communications.
     
  4. Nov 15, 2005 #3

    jtbell

    User Avatar

    Staff: Mentor

    For a cylindrical object with light coming in one end, yeah... but for a spherical object there's no incident angle that causes the light to be trapped permanantly inside.

    Leon, all you need for this is Snell's Law for refraction of a light ray, and a bit of geometry. Note that the angle of the ray after the first refraction (entering the sphere) has a certain maximum value, no matter what the incident angle is. That would be a good starting point for a proof.
     
    Last edited: Nov 15, 2005
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Spherical glass object with index of refraction N
  1. Index of refraction (Replies: 3)

Loading...