Question

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

Answer 1

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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