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10th Class Science Sample Paper Science Olympiad Model Test Paper-5

  • question_answer
    A 2.0 cm high object is placed at a distance of 20 cm from a concave mirror. A real image is formed at 40 cm from the mirror. Calculate the focal length of the mirror.

    A) \[+\,\,12.5\text{ }cm\]

    B) \[-\,\,13.3\,cm\]

    C) \[-\,\,16.4\,cm\]

    D) \[+\,\,14.3\,cm\]

    E) None of these            

    Correct Answer: B

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