Question

Focal length of plano-convex lens of refractive index n and radius of curvature R is (1) F = R (2) F=R/2 (3) F=n-1/R (4) F=R/n-1​

Answer 1

Answer:

radius: r-N r-y

bye have nice day

Answer 2

Answer:

his is a basic equation used to calculate the focal length of a lens

given the radius of curvature of the lens and the refractive index of

the lens relative to the medium. It is only an approximation and works best for thin lenses.

1/f = (n-1)(1/R1 - 1/R2) where n is the refractive index of the lens  

For a plano-convex lens R2 is flat. Therefore, 1/R2 is 1/infinity or zero.

The formula then becomes:

1/f = (n-1)(1/R1)

Explanation: