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10th Class Science Sample Paper Science Olympiad Model Test Paper-20

  • question_answer
    Calculate the focal length of a convex lens which produces a virtual image at a distance of 50 cm of an object placed at 20 cm in front of it.

    A) \[+\,13.3\,cm\]

    B) \[+\,33.3\,cm\]

    C) \[+\,26.6\,cm\]

    D)  \[-\,\,25.5\,cm\]

    E)  None of these

    Correct Answer: B

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