A double convex lens has power P and same radii of curvature R of both the surfaces. The radius of curvature of a surface of a plano-convex lens made of the same material with power 1.5P is
A double convex lens has power P and same radii of curvature R of both the surfaces. The radius of curvature of a surface of a plano-convex lens made of the same material with power 1.5P is
Option 1 -
2R
Option 2 -
R/2
Option 3 -
3R/2
Option 4 -
2R/3
Asked by Shiksha User
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1 Answer
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Correct Option - 4
Detailed Solution:P = (μ – 1) (1/R – 1/ (-R)
P = 2 (μ – 1)/R
1.5P = (μ – 1)/R') * 1.5 = 1/2R'
R' = R/3
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