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NEET Sample Paper NEET Sample Test Paper-42

  • question_answer
    A ray of light travelling in transparent medium of refractive index p falls on a surface separating the medium from air at an angle of incidence of \[45{}^\circ \] for which of the following value of\[\mu \]the ray can undergo TIR?

    A) \[\mu >1.33\]                

    B) \[\mu >1.4\] 

    C) \[\mu >1.5\]                 

    D) \[\mu >1.25\]

    Correct Answer: B

    Solution :

    Condition for TIR \[\operatorname{i}\ge C\] \[Sin\operatorname{i}\ge \operatorname{Sin}\operatorname{C}\]                            ?(1) \[\operatorname{Sin}\operatorname{C}=\frac{1}{\mu }\]              use the equation (1) \[\operatorname{Sin}\,\,i\ge \frac{1}{\mu }\] \[\mu \ge \sqrt{2}\Rightarrow \mu \ge 1.412\]


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