The focal length of the Plano convex lens is 2R where R is the radius of curvature of the surface ,then the refractive iindex is
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focal length of plano covex lens
(f) = R/n-1
here given f=2R
so, 2R = R/n-1
2= 1/n-1
n-1 = 1/2
n= 1+ 1/2
n=1.5
this is the answer....
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