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

  • question_answer
    A cube of side 2 misplaced in front of a concave mirror of focal length 1m with its face P at a distance of 3 m and face Q at a distance of 5 m from the mirror. The distance between the image efface P and Q is

    A) 1m  

    B) 0.5m

    C) 0.5m

    D) 025m

    Correct Answer: D

    Solution :

    [d] For \[P:\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\] \[\text{or }\frac{1}{{{v}_{P}}}+\frac{1}{-3}=\frac{1}{-1}\text{ or }{{\text{v}}_{P}}=-\frac{3}{2}m\] For \[Q:\frac{1}{{{v}_{Q}}}+\frac{1}{-5}=\frac{1}{-1}\text{ or }{{v}_{Q}}=\frac{-5}{4}m\] So horizontal distance between image of P and Q is 0.25m


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