Q. 15

Three rays (1, 2,

Answer :

Given:


Refractive index for ray 1, R1=1.39


Refractive index for ray 2, R1=1.47


Refractive index for ray 3, R1=1.52


Refractive index for air, μ1=1


Calculation:


The condition for total internal reflection is given by,


sin C = μ/R


Where C = critical angle


μ=Refractive index for air


R=refractive index of ray


For ray 1:


sin C1 = μ1/R1


C1=sin 1(1/1.39)


C1=460


For ray 2:


sin C2 = μ1/R2


C2=sin 1(1/1.47)


C2=42.860


For ray 3:


sin C3 = μ1/R3


C3=sin 1(1/1.52)


C3=41.130


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