10th Class Science Light - Reflection and Refraction Question Bank Light

  • question_answer
    How large will an image be formed of an artificial satellite, 5m in diameter, passing at an altitude of 500 km if it is photographed by a camera with a lens of focal length 10 cm.

    A) \[{{10}^{-2}}m\]            

    B)         \[{{10}^{-4}}m\]

    C) \[{{10}^{-6}}m\]                

    D)         \[5\times {{10}^{-6}}m\]

    Correct Answer: C

    Solution :

    \[m=\frac{v}{u}=\frac{I}{O}=\frac{f}{u}\] \[\therefore \]  \[\frac{I}{5}=\frac{10\times {{10}^{-2}}}{500\times {{10}^{3}}}\] \[\Rightarrow \]               \[\mathbf{I=1}{{\mathbf{0}}^{\mathbf{-4}}}\mathbf{m}\]


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