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JEE Main & Advanced Physics Ray Optics Question Bank Self Evaluation Test - Ray Optics and Optical Instruments

  • question_answer
    In figure find the total magnification after two successive reflections first on \[{{M}_{1}}\] and then on \[{{M}_{2}}.\]

    A) +1  

    B) -2        

    C) +2  

    D) -1        

    Correct Answer: C

    Solution :

    [c] For \[{{M}_{1}}:V=-\,60,{{m}_{1}}=-2\] For \[{{M}_{1}}:u=+20,F=10\] \[\frac{1}{V}=\frac{1}{20}=\frac{1}{10}\Rightarrow V=20\text{      }\therefore {{M}_{2}}=-\frac{20}{20}=-1\] \[\therefore M={{m}_{1}}\times {{m}_{2}}=+2\]


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