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JEE Main & Advanced Physics Ray Optics Question Bank Refraction at Curved Surface

  • question_answer
    A double convex lens is made of glass of refractive index 1.5. If its focal length is 30 cm, then radius of curvature of each of its curved surface is                                               [Bihar CEET 1995]

    A)            10 cm                                      

    B)            15 cm

    C)            18 cm                                      

    D)            None of these

    Correct Answer: D

    Solution :

               \[f=\frac{R}{2(\mu -1)}\Rightarrow 30=\frac{R}{2(1.5-1)}\Rightarrow R=30\]\[cm\]


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