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

  • question_answer
    An equiconvex lens has a power of 5 diopter. If it is made of glass of refractive index 1.5 then the radius of the curvature of each surface will be

    A) 20 cm

    B) 10 cm  

    C) 5 cm

    D) zero

    Correct Answer: A

    Solution :

    [a] The focal length of an equiconvex lens is given by \[\frac{1}{f}=\frac{2(\mu -1)}{R}\]. It is given that \[\frac{1}{f}=+5\] and \[\mu =1.5\]. Therefore, \[5=\frac{2(1.5-1)}{R}\] or \[R=\frac{1}{5}\] metre = 20 cm

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