Formula for Plano Convex Lens?

The focal length of each lens can be calculated using a simplified thick lens equation. f= R/(n-1), where n is the index of refraction and R is the radius of curvature of the lens surface. These lenses are fabricated from N-BK7, which has an Abbe Number of 64.17; this value is an indicator of the dispersion.

What is the formula of radius of curvature of plano convex lens?

In a plano-convex lens the radius of curvature of the plane side being R1=∞ is equal to infinity. As, the mirror needs to be part of the sphere and for it to be flat the radius of the sphere has to be infinity. Radius of curvature of the convex side is R2=−20cm as given in the question.

What is focal length of plano convex lens?

The focal length of a plano convex lens is ′f′ and its refractive index is 1.5. It is kept over a plane glass plate with its curved surface touching the glass plate. The gap between the lens and the glass plate is filled by a liquid. As a result, the effective focal length of the combination becomes 2f.