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CMC Medical CMC-Medical VELLORE Solved Paper-2007

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

    A)  3                                            

    B)  5

    C)  7                                            

    D)  9

    Correct Answer: B

    Solution :

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


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