2. Solved Papers
  3. JIPMER

JIPMER Jipmer Medical Solved Paper-2006

  • question_answer
    If the focal length of a lens of a camera is \[5f\]and that of another is 2. \[5f,\], what is the time of exposure for the second, if for the first one is \[\frac{1}{200}s?\] (where\[f\]is focal length/unit aperture)

    A) \[\frac{1}{200}\]              

    B)                        \[\frac{1}{800}\]                              

    C) \[\frac{1}{6400}\]                            

    D)        \[\frac{1}{3200}\]

    Correct Answer: B

    Solution :

    Ratio of time of expoiusers \[\frac{{{t}_{1}}}{{{t}_{2}}}={{\left( \frac{{{f}_{1}}}{{{f}_{2}}} \right)}^{2}}={{\left( \frac{5f}{2.5f} \right)}^{2}}\] \[\Rightarrow \]               \[\frac{1/200}{{{t}_{2}}}={{(2)}^{2}}\] \[\Rightarrow \]                        \[{{t}_{2}}=\frac{1}{800}s\]


You need to login to perform this action.
You will be redirected in 3 sec spinner