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

  • question_answer
    An achromatic prism is made by combining two prisms \[{{P}_{1}}({{\mu }_{v}}=1.523,\,{{\mu }_{r}}=1.515)\] and \[{{P}_{2}}({{\mu }_{v}}=1.666,\,{{\mu }_{r}}=1.650)\]; where \[\mu \] represents the refractive index. If the angle of the prism \[{{P}_{1}}\] is 10°,  then the angle of the prism P2 will be [MP PMT 1991]

    A)            5°   

    B)            7.8°

    C)            10.6°                                        

    D)            20°

    Correct Answer: A

    Solution :

               \[A({{\mu }_{v}}-{{\mu }_{r}})+{A}'({{{\mu }'}_{v}}-{{{\mu }'}_{r}})={{0}^{o}}\Rightarrow {A}'={{5}^{o}}\]


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