Light falls from glass (n = 1.5) to air. find the angle of incidence from which the angle of deviation is 90 0 ?
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μ glass=1/ sin c. ( Where c is the angle of incidence or critical angle)
1.5=1/sin c
Sin c=2/3
C is approximately 42°
1.5=1/sin c
Sin c=2/3
C is approximately 42°
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