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Chhattisgarh PMT Chhattisgarh PMT Solved Paper-2005

  • question_answer
    An object of height 1.5 cm is placed on the axis of a convex lens of focal length 25 cm. A real image is formed at a distance of 75 cm from the lens. The size of the image will be

    A)  4.5cm                                  

    B)  3.0cm

    C)  0.75cm                                

    D)  0.5cm

    Correct Answer: B

    Solution :

    Magnification \[m=\frac{I}{O}=\frac{-v}{u}\] Given:                   \[O=1.5cm\] By, lens formula  \[\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\]                                 \[\frac{1}{25}=\frac{1}{75}-\frac{1}{u}\] or \[u=-\frac{75}{2}cm\] \[\therefore \]  \[\frac{I}{1.5}=-\frac{75}{(-75/2)}\] or            \[I=3cm\]


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