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The refractive index of first medium …

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The refractive index of first medium is 1.25 and focal length of convex lens is 20cm if the radius of curvature first side of lens is 20cm and second radius of curvature is 10cm then find the refractive index of other medium

Posted by Deepu Kumar Yadav 2 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Anjan Karthi 2 years, 2 months ago

According to lens makers' formula, 1/f = (n 21 - 1) 1/R1 - 1/R2. n 21 - 1 = 1/f ( R1 R2 / R1 + R2). n 21 - 1 = 1/20 (20 × 10 / 30). n 21 - 1 = 1/20 (20/3) = 1/3. n 21 = 1 + 1/3 = 4/3. n2/n1 = 4/3. n2 / 1.25 = 4/3. Therefore, the refractive index of the second medium n2 = 4 × 1.25 / 3 = 5/3 = 1.67. //

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