Question

The focal length of the plano convex lens os 2R where R is the radius of curvature of the surface

Answer 1

Explanation:

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

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