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  • When a ray of light is incident normally on one refracting surface of an equilateral prism, than (Refractive index of the material of the prism <img alt="=1.5" src="https://entrancecorner.oncodecog

When a ray of light is incident normally on one refracting surface of an equilateral prism, than (Refractive index of the material of the prism =1.5)

Option: 1

emerging ray is deviated by 30^{\circ}


Option: 2

emerging ray is deviated by 45^{\circ}


Option: 3

emerging ray just grazes the second refracting surface


Option: 4

the ray undergoes total internal reflection at the second refracting surface


Answers (1)

best_answer

Here,\ \mathrm{i}_1=0=\mathrm{r}_1\\ Therefore,\ r_2=A=60^{\circ} \\ \begin{aligned} & \theta_c=\sin ^{-1}\left(\frac{1}{1.5}\right)=41.8^{\circ} \\ & \Rightarrow r_2>\theta_c \end{aligned}

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Shailly goel

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