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JEE Main & Advanced AIEEE Paper (Held On 11 May 2011)

  • question_answer
    When monochromatic red light is used instead of blue light in a convex lens, its focal length will:     AIEEE  Solved  Paper (Held On 11 May  2011)

    A)  increase                               

    B)  decrease

    C)  remain same                            

    D)  does not depend on colour of light

    Correct Answer: A

    Solution :

                     \[{{\mu }_{R}}<{{\mu }_{B}}\]                 \[\frac{1}{f}=(\mu -1)\left( \frac{1}{{{R}_{1}}}-\frac{1}{{{R}_{2}}} \right)\]                 \[\frac{1}{{{f}_{B}}}>\frac{1}{{{f}_{R}}}\]                 \[{{f}_{R}}>{{f}_{B}}.\]


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