JEE Main & Advanced Physics Ray Optics Question Bank Refraction at Curved Surface

  • question_answer
    The focal lengths for violet, green and red light rays are \[{{f}_{V}},{{f}_{G}}\]and \[{{f}_{R}}\] respectively. Which of the following is the true relationship    [BHU 2004; CBSE PMT 1997]

    A)            \[{{f}_{R}}<{{f}_{G}}<{{f}_{V}}\]                                     

    B)            \[{{f}_{V}}<{{f}_{G}}<{{f}_{R}}\]

    C)            \[{{f}_{G}}<{{f}_{R}}<{{f}_{V}}\]                                     

    D)            \[{{f}_{G}}<{{f}_{V}}<{{f}_{R}}\]

    Correct Answer: B

    Solution :

               \[f\propto \frac{1}{\mu -1}\] and \[\mu \propto \frac{1}{\lambda }\]


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