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

  • question_answer
    A film projector magnifies a 100 cm2 film strip on a screen. If the linear magnification is 4, the area of magnified film on the screen is                           [NCERT 1980;  CPMT 1977, 91; MP PET 1985, 89; RPMT 2001; BCEC 2005]

    A)            1600 cm2                                                 

    B)            400 cm2 

    C)            800 cm2                                                    

    D)            200 cm2

    Correct Answer: A

    Solution :

                       \[{{m}_{L}}=4\]            \[{{m}_{A}}={{({{m}_{1}})}^{2}}\]so that \[\Rightarrow dv=-{{\left( \frac{v}{u} \right)}^{2}}du\]


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