JEE Main & Advanced Physics Ray Optics Sample Paper Topic Test - Refraction of Light Through Curved Surfaces

  • question_answer
    A thin linear object of size 1 mm is kept along the principal axis of a convex lens of focal length 10 cm. The object is at 15 cm from the lens. The length of the image is:

    A) 1 mm

    B) 4 mm

    C) 2 mm

    D) 8 mm

    Correct Answer: B

    Solution :

    [b] \[\frac{1}{10}=\frac{1}{V}=-\frac{1}{(-15)}\Rightarrow v=+30\,cm\] for small object \[dv=\frac{{{v}^{2}}}{{{u}^{2}}}du={{\left( \frac{30}{15} \right)}^{2}}\times 1=4\,mm\]

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