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[" 35.A parallel beam of light is incide...

[" 35.A parallel beam of light is incident from air at "],[" an angle "alpha" on the side "PQ" of a right angled "],[" triangular prism of refractive index "n=sqrt(2)" .Light "],[" undergoes total internal reflection in the prism "],[" at the face PR when "alpha" has a minimum value of "v],[45^(@)." The angle "theta" of the prism is: "],[[" (1) "30^(@)," (0) "],[" (3) "25^(@)," n=sqrt(2) "_(R)]],[[" (4) "15^(@)," a "n=sqrt(2)]]

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