A right angled isosceles prism is used in air μair=1 for reflecting back a ray as shown. This is possible if refractive index of prism μ:

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A right angled isosceles prism is used in air $(μ_{air} = 1)$ for reflecting back a ray as shown. This is possible if refractive index of prism $(μ)$ :

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$μ = 1.35$

$μ = 1.25$

$μ = 1.65$

$μ = 1.50$

answer is C, D.

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Detailed Solution

For TIR,

$\sin θ > \sin θ_{c} \sin 45 ° > \frac{1}{n} \Rightarrow \frac{1}{\sqrt{2}} > \frac{1}{n} \Rightarrow n > \sqrt{2}$

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