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

  • question_answer
    A thin prism P1 with angle 4° and made from glass of refractive index 1.54 is combined with another thin prism P2 made from glass of refractive index 1.72 to produce dispersion without deviation. The angle of prism P2 is           [MP PMT 1991, 92; IIT-JEE 1990; MP PET 1995, 99; UPSEAT 2001; RPMT 2004]

    A)            2.6°                                          

    B)            3°

    C)            4°   

    D)            5.33°

    Correct Answer: B

    Solution :

                       For dispersion without deviation \[\frac{A}{{{A}'}}\]= \[\frac{({\mu }'-1)}{(\mu -1)}\]            \[\frac{4}{{{A}_{F}}}=\frac{(1.72-1)}{(1.54-1)}=\frac{0.72}{0.54}\] or \[{{A}_{F}}=\frac{4\times 0.54}{0.72}={{3}^{o}}\]


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