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JEE Main & Advanced Sample Paper JEE Main Sample Paper-13

  • question_answer
    A 1 m long mirror is placed at a distance 4 m from a tall building as shown in figure. What height of the building can be seen in the mirror from a point \[O\] at a distance 2 m from the mirror?

    A)  1 m                                       

    B)  2

    C)  3 m                                       

    D)  4 m

    Correct Answer: C

    Solution :

     Triangles QBR and BOA are similar, hence, \[{{v}_{T}}=\frac{4}{3}\,\pi \frac{{{R}^{2}}\rho g}{k}\] or            \[{{C}_{4}}{{H}_{10}}O\] \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}OH\]           Height of the building which can be observed in the mirror from point O,  \[C{{H}_{3}}-C{{H}_{2}}-\underset{\begin{smallmatrix}  | \\  OH \end{smallmatrix}}{\mathop{C}}\,H-C{{H}_{3}}\]


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