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NEET Sample Paper NEET Sample Test Paper-78

  • question_answer
    In figure shown, there are two convex lenses \[{{L}_{1}}\,\,and\,\,{{L}_{2}}\] having focal length \[{{F}_{1}}\,\,and\,\,{{F}_{2}}\] respectively. The distance between \[{{L}_{1}}\,\,and\,\,{{L}_{2}}\] will be

    A)  \[{{\operatorname{F}}_{1}}\,\,+\,\,{{F}_{2}}\]            

    B)  \[{{\operatorname{F}}_{1}}\,\,-\,\,{{F}_{2}}\]

    C)  \[{{\operatorname{F}}_{1}}\]                           

    D)  \[{{F}_{2}}\]

    Correct Answer: A

    Solution :

    \[{{L}_{1}}\] will converge the parallel ray at its focus and \[{{L}_{2}}\] will render it parallel only when the refracted ray starts form focus of Lg. \[\therefore \,\,\,\, Distance between {{L}_{1}} and {{L}_{2}} ={{F}_{1}} + {{F}_{2}}\]


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