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10th Class Science Sample Paper Science Olympiad Model Test Paper-19

  • question_answer
    An object 60 cm from a lens gives a virtual image at a distance of 20 cm in front of the lens. What is the focal length of the lens?

    A) \[-\,\,12\,cm\]

    B) \[-\,\,30\,cm\]

    C)  \[+\,\,30\,cm\]

    D)  \[+\,\,12\,cm\]

    E)  None of these

    Correct Answer: B

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