What is the Total Internal Reflection of Light Use

In which one of the following the phenomenon of total internal reflection of light is used ?

  1. Formation of mirage
  2. Working of binoculars
  3. Formation of rainbow
  4. Twinkling of stars
Manish Listener Asked on 18th June 2015 in Physics.
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  • 2 Answer(s)

    Formation of Rainbow

    Total internal reflection happens when a propagating wave strikes a medium boundry at an angle larger than a particular critical angle.

    Monis Rasool Professor Answered on 21st June 2015.
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    2: The working of binoculars.

    Binoculars need to increase the separation of the collectors, so that far-away objects can still be seen stereoscopically. Prism binoculars rely on TIR so that they don’t have to use reflective coatings to achieve the reflections needed to narrow the separation to that of your eyes.

    It is a common misconception that rainbows are caused by TIR. Not only is that false, TIR is physically impossible inside the spherical raindrops that produce rainbows. By definition, the light enters the drop at less than the critical angle. The path of the light inside the drop forms an isosceles triangle with the surface normals (radii) of the drop, so the angle when it reflects is always less than the critical angle.

    JeffJo Default Answered on 14th May 2016.
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