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  5. Light - Reflection and Refraction

10th Class Science Light - Reflection and Refraction Question Bank Light

  • question_answer
    A double convex lens of focal length 15 cm is to be used as a magnifying glass. In order to produce an erect image which is 3 times magnified, the distance between the object and the lens should be

    A) \[+\text{ 5 cm}\]         

    B)                         \[+\text{ 1}0\text{ cm}\]  

    C) \[+\text{ 15 cm}\]         

    D)        \[~\text{2}0\text{ cm}\]

    Correct Answer: B

    Solution :

                    \[m=\frac{f}{u-f}\]                    \[=10\,\,cm\]


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