**Contents**show

## What is the radius of curvature of a flat lens?

radius of curvature for a flat surface is **infinity**. the larger the radius of curvature, the flatter the surface will appear.

## What is the focal length of plano convex lens when its radius of curvature of the surface is R and N is refractive?

Find the focal length of plano convex lens, when its radius of curvature of the surface is R and n is the refractive index of the lens? ⇒**1f=(n-1)R⇒f=R(n-1)**.

## What is the formula of plano convex lens?

**f=R/2**.

## What is a plano convex lens?

Plano-convex lenses are **positive focal length elements that have one spherical surface and one flat surface**. These lenses are designed for infinite conjugate (parallel light) use or simple imaging in non-critical applications. These optic lenses are ideal for all-purpose focusing elements.

## How do you increase radius of curvature?

Or, we could go the other way, if **we decrease the amount of curvature**, we get an increase in the amount of curvature radius. In any event, when one factor moves, the other factor goes in an opposite direction.

## What is the radius of curvature of double convex lens?

The radii of curvature of the surfaces of a double convex lens are **20 cm and 40 cm** respectively, and its focal length is 20 cm.

## What will be the focal length of plano convex lens?

**f=R/2**.

## How do you identify a convex lens?

The structure of convex lens is like, **thicker at the centre and thinner at the edges**. Conversely, the concave lenses are thinner at the centre and thicker at its edges, in structure. The focal length of a convex lens is positive, while that of a concave lens is negative.

## Is the power of a lens is 2D what is its focal length?

Power of a lens is -2D, negative sign indicates it is a Concave lens. Focal length (in meters)=1/power of the lens, thus focal length=1/2=0.5m=50cm. Answer: Since, **Power P = -2 D**, Focal length f = 100/(-2) = – 50 cm.