NTSE Stage 2 SAT 2018 Exam Question Paper

Question : 37 of 100

Marks: +1, -0

A ray of light of pure single colour is incident on the face of a prism having angle of the prism 30º at an angle of incidence 45º. The refracted ray does not change its direction as it crosses the other face and emerges out of the prism. The refractive index of the material of the prism is:

$2/√3$
2
$√2$
$√3$

Validate

Solution:

Using Snell’s law, refractive index,

µ=\;\;{\sin45^{∘}}/{\sin30^{∘}}=\;\;{2}/{√{2}}=√{2}

(Doesn’t change means incident at 90° on another surface, so

∠r=30°

)

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