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RAJASTHAN PMT Rajasthan - PMT Solved Paper-1997

  • question_answer
    If the refractive index of a material for red, yellow and voilet colours are 1.42, 1.50, 1.62. Then dispersive power of the material will be:

    A)  0.4                        

    B)         1.33      

    C)  0.2                        

    D)         0.1

    Correct Answer: B

    Solution :

    Dispersive power of material \[\omega =\frac{{{n}_{\upsilon }}-{{n}_{r}}}{{{n}_{y}}-1}\] \[=\frac{1.62-1.42}{1.5}=1.33\]


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