A ray of light is travelling from a denser medium to rarer medium. For these media the critical angle is C. The maximum possible deviation of the ray is ...........[Hint : The situation at total reflection is shown in the figure.]

A ray of light is travelling from a denser medium to rarer medium. For

1.	A ray of light is travelling from a denser medium to rarer medium. For these media the critical angle is C. The maximum possible deviation of the ray is ...........[Hint : The situation at total reflection is shown in the figure.]
Answer» `pi-2` `pi-2C` 2C `pi/2+C` Solution :From figure, `delta`=r-i But if i=C`impliesr=90^@=pi/2` `THEREFORE delta=pi/2-C` `therefore2 delta=pi-2C` Where,`2DELTA` is maximum deviation. Second Method : Deviation becomes maximum when ray of light experiences TOTAL internal refraction. From it is clear that maximum deviation `theta=pi-(C+C)=pi-2C` [Note : angle of incidence for `theta_i gt C` is taken as `theta_i cong C`.]

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A ray of light is travelling from a denser medium to rarer medium. For these media the critical angle is C. The maximum possible deviation of the ray is ...........[Hint : The situation at total reflection is shown in the figure.]

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