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Manipal Engineering Manipal Engineering Solved Paper-2012

  • question_answer
    A ray reflected successively from two plane mirrors inclined at a certain angle undergoes a deviation of\[{{240}^{o}}\]. Then, the number of images observable is

    A)  3                                            

    B)  5

    C)  7                            

    D)         9

    Correct Answer: B

    Solution :

    \[D={{360}^{o}}-2\theta \]   \[\Rightarrow \]   \[{{240}^{o}}={{360}^{o}}-2\theta \] \[2\theta ={{120}^{o}}\],                              \[\therefore \,\,\theta ={{60}^{o}}\] Then, number of images observable                                 \[N=\frac{{{360}^{o}}}{{{60}^{o}}}-1\]                                 \[N=6-1\]                                 \[N=5\]


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