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10th Class Science Human Eye and Colourful World Question Bank The Human Eye and the Colourful World

  • question_answer
    A The power of a lens is +2.5 D. What kind of lens is it and what is its focal length?

    A)  Concave lens, 100 cm

    B)  Concave lens, 40 cm

    C)  Convex lens, 40 cm

    D)  Convex lens, 50 cm

    Correct Answer: C

    Solution :

    The power of the given lens has positive sign, so it is convex lens. So, \[+2.5=\frac{1}{f},f=\frac{1}{2.5}m=\frac{1}{2.5}\times 100\,cm\]


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