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Radii of curvature of 2 faces …

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Radii of curvature of 2 faces of a double convex lens are 10cm and 15cm. If focal length of lens in 12cm., find refractive index of material of lens

    • Posted by Kamlesh Kumar 6 years, 3 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Disha Verma 6 years, 3 months ago

    R1= +10cm R2= -15 cm f=12cm 1/f=( refractive index-1) ( 1/R1-1/R2) 1/12= (refractive index-1) (1/10-1/-15) 1/12=(refractive index-1)(1/6) 6/12= (refractive index -1) 0.5+1= refractive index 1.5 = refractive index

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