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JEE Main & Advanced Physics Ray Optics Question Bank Microscope and Telescope

  • question_answer
    An achromatic telescope objective is to be made by combining the lenses of flint and crown glasses. This proper choice is [CPMT 1977]

    A)            Convergent of crown and divergent of flint 

    B)            Divergent of crown and convergent of flint 

    C)            Both divergent 

    D)            Both convergent  

    Correct Answer: A

    Solution :

               For achromatic telescope objective lens, convergent of crown and divergent of flint is the best combination because \[{{\mu }_{crown}}<{{\mu }_{flint}}\]


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