Question

    An optical device Y has a positive focal length. Y

    is:
    A either a concave lens or a concave mirror Correct Answer Incorrect Answer
    B either a convex lens or a convex mirror Correct Answer Incorrect Answer
    C either a convex lens or a concave mirror Correct Answer Incorrect Answer
    D either concave lens or a convex mirror Correct Answer Incorrect Answer

    Solution

    The correct answer is B

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