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JEE Main & Advanced JEE Main Paper (Held on 09-4-2019 Afternoon)

  • question_answer
    A convex lens of focal length 20 cm produces images of the same magnification 2 when an object is kept at two distances \[{{x}_{1}}\] and \[{{x}_{2}}\] \[({{x}_{1}}>{{x}_{2}})\]from the lens. The ratio of \[{{x}_{1}}\] and \[{{x}_{2}}\] is :-             [JEE Main 9-4-2019 Afternoon]

    A) 5 : 3

    B)              2 : 1

    C) 4 : 3                

    D) 3 : 1

    Correct Answer: D

    Solution :

    Magnification is 2 If image is real, \[{{x}_{1}}=\frac{3f}{2}\] If image is virtual, \[{{x}_{2}}=\frac{f}{2}\] \[\frac{{{x}_{1}}}{{{x}_{2}}}=3.1.\]


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