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

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    Flint glass prism is joined by a crown glass prism to produce dispersion without deviation. The refractive indices of these for mean rays are 1.602 and 1.500 respectively. Angle of prism of flint prism is 10°, then the angle of prism for crown prism will be                                                                 [DPMT 2001]

    A)            12°2.4'                                     

    B)            12°4?

    C)            1.24°                                        

    D)            12°

    Correct Answer: A

    Solution :

                       For dispersion without deviation \[\frac{A}{{{A}'}}=\left( \frac{{{{{\mu }'}}_{y}}-1}{{{\mu }_{y}}-1} \right)\]            \[\therefore \]\[\frac{A}{10}=\frac{(1.602-1)}{(1.500-1)}=\frac{0.602}{0.500}\] Þ \[A=12{}^\circ 2.4'\]


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