A right angled prism is placed on a printed page as shown in figure. observer A look through the vertical face while the observer B looks through the inclined face. Identify the correct statement.
Text Solution
Verified by ExpertsThe correct answer is:
A
A can not see if ray will go for total internal reflection at vertical face.
∴ (90 – γ ) minmum > θ c
(90 – γ ) min : 90 – γ max
90 – γ max > θ c
90 – θ c > θ c
45 > θ c
Sin 45 > Sin θ c = µ > 
A can not see if µ > 
For B if he can not see then 60 – γ max > θ c
60 – θ c > θ c
30 > θ c
> 
µ > 2
B can not see if µ > 2
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