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RAJASTHAN PMT Rajasthan - PMT Solved Paper-2000

  • question_answer
    Image formed by a concave mirror of focal length 6 cm, is 3 times of the object, then the distance of object from mirror is:

    A)  - 4 cm                  

    B)         8 cm

    C)  6 cm                     

    D)         12 cm

    Correct Answer: A

    Solution :

    Magnification \[m=-\frac{\upsilon }{u}\] \[\upsilon =3u\]                                               \[(\therefore m=3\] \[\frac{1}{\upsilon }+\frac{1}{u}=\frac{1}{f}\]             \[\frac{1}{3u}+\frac{1}{u}=4\] \[\Rightarrow \]                 \[\,u=-4\,cm\]


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