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BCECE Medical BCECE Medical Solved Papers-2013

  • question_answer
    A ray is incident at an angle of incidence i on one surface of a prism of small angle A and emerges normally from the opposite surface. If the refractive index of the material of the prism is \[\mu \], the angle of incidence \[i\] is nearly equals to

    A)  \[\mu \,A/2\]                 

    B)  \[A/2\,\mu \]

    C)   \[\mu \,A\]

    D)  \[A/\mu \]

    Correct Answer: C

    Solution :

    For a small angle prism, \[\delta =(u-1\,A\] ... (i) Since, the ray emerges normally, \[\therefore \] e = 0 By the relation, \[A+\delta =i+e\] We have, \[i=A+\delta \] or \[6=(i-A)\] ... (ii) From Eqs. (i) and (ii) \[(i-A)=(\mu -i)A\] \[\Rightarrow \] \[i=\mu A\]


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