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State the Conditions Required for Total Internal Reflection of Light to Take Place - Physics

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Question

State the conditions required for total internal reflection of light to take place

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Solution

Conditions necessary for total internal reflection to take place are

1) Light must travel from a denser medium to a rarer medium.

2) The angle of incidence must be greater than the critical angle for the pair of media.

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2016-2017 (March) Set 1

RELATED QUESTIONS

A light ray does not bend at the boundary in passing from one medium to the other medium if the angle of incident is ______.


Draw diagram to illustrate the total internal reflection.


Write the necessary conditions for the phenomenon of total internal reflection to

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The observation made by Swarali while doing the experiment is given below. Based on these write answers to the questions:

Swarali found that the light ray travelling from the denser medium to rarer medium goes away from the normal. If the angle of incidence (i) is raised by Swarali, the angle of refraction (r) went on increasing. However, after certain value of the angle of incidence the light ray is seen to return back into the denser medium.

Questions:

  1. What is the specific value of∠i called?
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  3. Draw the diagrams of three observations made by Swarali.

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Total Internal reflection takes place when 

(where ∠i = angle of incidence,  ∠r = angle of refraction, ∠C = critical angle)


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  • Assertion (A): Propagation of light through an optical fibre is due to total internal reflection taking place at the core-cladding interface.
  • Reason (R): Refractive index of the material of the cladding of the optical fibre is greater than that of the core.

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