Diameter of a plano-convex lens is 6 cm and thickness at the centre is 3 mm. If the speed of light in the material of the lens is 8 1 2 10 ms , focal length of the lens is 1) 15 cm 2) 20 cm 3) 30 cm 4) 10 cm
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Explanation:
n=c/v = 1.5
R ² -(R -0.3 )² = 3²
R² - R² + 0.6R +0.09 = 9
R = 15 cm
f = R /(n-1)
= 15 / 0.5
= 30 cm
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