Total internal reflection Total internal

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					                                  Total internal reflection

Introduction



Internal reflection

A light ray hits the inside face of a semicircular block as follows.



What will happen?




For a small angle of incidence




      as angle of incidence ,
angle of incidence continues to ,




Therefore, if angle of incidence > C,




Critical angle and refractive index
Example 5
A ray of light travelling in the direction EO in air enters a rectangular block.

       angle of incidence = 30
       angle of refraction = 18




(a)    Find the refractive index n of the block.




(b)    Find the critical angle C of the ray for the block.




(c)     If the ray is incident on surface BC, from which surface and at what angle will the ray
leave the block?

				
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posted:12/9/2011
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