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10th Class Science Light - Reflection and Refraction Question Bank Light

  • question_answer
    In an achromatic combination of two prisms, the ratio of the deviations produced by the two prisms is 2 : 3, the ratio of their dispersive powers is

    A)  2 : 3                      

    B)         3 : 2  

    C)  \[1:1\]                 

    D)         4 : 9

    Correct Answer: B

    Solution :

     In achromatic combination,                 \[{{\theta }_{c}}={{\theta }_{f}}\] we know,            \[\omega =\frac{\theta }{{{\delta }_{y}}}\] and since \[\theta \] is same, therefore                 \[\frac{{{\omega }_{1}}}{{{\omega }_{2}}}=\frac{{{\delta }_{2}}}{{{\delta }_{1}}}=\frac{3}{2}\]


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