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

  • question_answer
    A plano convex lens is made of glass of refractive index 1.5. The radius of curvature of its convex surface is R. Its focal length is                                                     [RPET 2003]

    A)            R/ 2                                          

    B)            R

    C)            2R  

    D)            1.5 R

    Correct Answer: C

    Solution :

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


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