Question

Relation between focal length, refractive index and radius of curvature of Plano convex lens

Answer 1

the relation between focal length is C/2

Answer 2

Answer:

The general relation between focal length, refractive index and radius of curvature is

$\frac{1}{f} = (n-1)$×$\frac{1}{R_{1} }$-$\frac{1}{R_{2} }$

where n = refractive index

           f  = focal length

           R = radius of curvature

For a plano-convex lens $R_{2}$ is flat. Therefore, $R_{2}$ is $\frac{1}{infinity}$ or zero.

The formula then becomes:

 $\frac{1}{f} = (n-1)$×$\frac{1}{R_{1} }$