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

  • question_answer
    We wish to make a piano concaved lens of focal length 16 cm from glass having refractive index\[\text{1}\text{.5}\]. It is to be used in air. What would be the radius of curvature of the curved surface?

    A)  8cm  

    B)  12cm

    C)  16 cm

    D)  24cm

    Correct Answer: A

    Solution :

                    \[\frac{1}{f}=(\mu -1)\left( \frac{1}{R}+\frac{1}{\infty } \right)=\frac{0\cdot 5}{R}=\frac{1}{2R}\] But         \[f=2R\] \[\therefore \]  \[R=\frac{f}{2}=\frac{16}{2}=\mathbf{8}\]           


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