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JEE Main & Advanced Physics Ray Optics Question Bank Microscope and Telescope

  • question_answer
    The focal lengths of the objective and eye-piece of a telescope are respectively 100 cm and 2 cm. The moon subtends an angle of \[{{0.5}^{o}}\,\]at the eye. If it is looked through the telescope, the angle subtended by the moon's image will be                                                                        [MP PMT 2000; DCE 2003]

    A)            \[{{100}^{o}}\]                    

    B)            \[{{50}^{o}}\]

    C)            \[{{25}^{o}}\]                       

    D)            \[{{10}^{o}}\]

    Correct Answer: C

    Solution :

               \[\frac{\beta }{\alpha }=\frac{{{f}_{o}}}{{{f}_{e}}}\Rightarrow \frac{\beta }{{{0.5}^{o}}}=\frac{100}{2}\Rightarrow \beta ={{25}^{o}}\]


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