7th Class Science Light Question Bank Light

  • question_answer
    A bus driver is reversing his bus at a speed\[8\text{ }m\text{ }{{s}^{-1}}\]. The rear view mirror of a bus is a plane mirror. The driver sees in his rear view mirror the image of a car parked behind his bus. The speed at which the image of the car appears to approach the driver will be

    A)  \[2\text{ }m\text{ }{{s}^{-1}}\]                 

    B)  \[4\text{ }m\text{ }{{s}^{-1}}\]     

    C)  \[8\text{ }m\text{ }{{s}^{-1}}\]       

    D)              \[16\text{ }m\text{ }{{s}^{-1}}\]   

    Correct Answer: D

    Solution :

    The speed at which the image of the car appears to approach the driver will be \[(2\times 8)m\,{{s}^{-1}}=16\,m{{s}^{-1}}.\] because rear view mirror is a plane mirror.                   


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