10th Class Science Sample Paper Science Olympiad Model Test Paper-4

  • question_answer
    A convex lens has a focal length 20 cm. Find power of the lens.

    A) \[+\,2D\]

    B) \[-\,2D\]

    C) \[+\,5D\]

    D) \[-\,5D\]

    E) None of these

    Correct Answer: C


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