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

  • question_answer
    A thin prism \[{{P}_{1}}\] with angle 6° and made from glass of refractive index 1.54 is combined with another thin prism P2 of refractive index 1.72 to produce dispersion without deviation. The angle of prism  \[{{P}_{2}}\] will be              [MP PMT 1999]

    A)            5° 24?                                       

    B)            4° 30?

    C)            6°   

    D)            8°

    Correct Answer: B

    Solution :

                       \[\frac{{{A}'}}{A}=\frac{({{\mu }_{y}}-1)}{({{\mu }_{y'}}-1)}\Rightarrow \frac{{{A}'}}{6}=-\frac{(1.54-1)}{(1.72-1)}\] Þ A' \[=-\,{{4.5}^{o}}={{4}^{o}}3{0}'\]


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