# Why R1 of plano convex lens is infinity?

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the plano convex lens is plane from one side . and in the mirror formula R1 and R2 are the radii of the two circular parts. since one part is flat it is considered to have an infinite radius.

## Why the radius of curvature of plano convex lens is infinity?

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.

## What is infinity in convex lens?

At infinity. At focal point. Image is a point. Moving toward 2F. Moving from F toward 2F.

## What is R1 and R2 for plano concave lens?

R1 is positive as it is measured from the left surface and extends to the right. R2 is negative as it is measured from the right surface and extends to the left. As per: For a double convex lens the radius R1 is positive since it is measured from the front surface and extends right to the center of curvature.

## What is R1 and R2 in lens makers formula?

R1 is the radius of curvature of the lens surface closest to the light source, R2 is the radius of curvature of the lens surface farthest from the light source, d is the thickness of the lens.

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## What is the radius of curvature of the flat side of a plano convex lens?

The radius of curvature of the convex surface of a planoconvex lens is 95.2cm.

## How do you find the radius of curvature of a plano convex lens?

It well known that radius of curvature of a plano convex lens can be determined using Newton’s Rings set up making use of Interference by division of amplitude principle. The general method widely used involves measurement of diameter of several circular dark fringes.