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  3. 10th Class
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  5. Light - Reflection and Refraction

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

  • question_answer
    If a real object is placed in front of a convex lens of focal length 'f' at its principal focus, where is the image formed?

    A) At zero

    B) At infinity

    C) At a distance of 2f

    D) At a distance f/2

    Correct Answer: B

    Solution :

    When a real object is placed infront of a convex lens of focal length 'f' at its principal focus, then the image is formed at infinity. \[\because \]\[-\frac{1}{f}=\frac{1}{v}-\frac{1}{f},\frac{1}{v}=0\](or) \[v=\infty \]


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