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Focal length of a biconvex lens …

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Focal length of a biconvex lens in air is 40 cm.the focal length of the lens in water is 120. If refractive index of water is 4/3. What is refractive index of material of lens?

    • Posted by Devesh Talan 5 years, 5 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Rohit Krishna 5 years, 5 months ago

    If I'm right about this,use lens maker formula for case 1:lens in the air and case 2:lens in the water,where the values are correspondingly substituted.The formula is 1/f=(n2-n1/n1)(1/R1-1/R2) ((Please note that units are not considered since both ways you get the same answer as refractive index has no units...)) And also,for both the cases,radii of curvature of the lens is a constant.Therefore,when you divide both the equations you arrive at the answer.The answer is approximately 1.6 (It would be better if you write the steps and do the calculations by yourself as it would help you in understanding the concept pretty easier.)

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