JEE Main & Advanced Physics Question Bank Prism Theory and Dispersion of Light

  • question_answer
    A parallel beam of monochromatic light is incident at one surface of a equilateral prism. Angle of incidence is 55° and angle of emergence is 46°. The angle of minimum deviation will be                                      [DPMT 1999]

    A)            Less than 41°                        

    B)            Equal to 41°

    C)            More than 41°                     

    D)            None of the above

    Correct Answer: A

    Solution :

                       By the hypothesis, we know that                    \[{{i}_{1}}+{{i}_{2}}=A+\delta \Rightarrow {{55}^{o}}+{{46}^{o}}={{60}^{o}}+\delta \]\[\Rightarrow \]\[\delta ={{41}^{o}}\]            But \[{{\delta }_{m}}<\delta ,\]so \[{{\delta }_{m}}<{{41}^{o}}\]


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