A glass prism of refractive index 1.5 is immersed in water of refractive index 4/3 as shown in figure.A ray of light incident normally on face AB is totally reflected at the face AC if sinq is: A)less than or equal to 2/3 B)greater than 8/9 C)0.8666 D)between 2/4 and 8/9 Explain?

Asked by team admin | 17th Nov, 2010, 06:29: PM

Expert Answer:

for portion of AC not in the water,
To obtain Total internal Reflection (TIR) we must have
If (2) is satisfied then (1) is also satisfied because  8/9 > 2/3
hence B) is correct

Answered by  | 17th Nov, 2010, 11:26: PM

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