# What is the focal length of double concave lens with a radius of curvature?

Contents

The correct answer is 50 cm.

## What is the focal length of a double concave lens with a radius of curvature 20 cm if the refractive index?

20 cm, -125.4 cm]

## What is the focal length of a double concave lens with a radius of curvature 20 cm?

R1 is the radius of the spherical surface on the which the light rays are incident and R2 is the radius of the spherical surface on the other side, according to the sign convection. It is given that the focal length of the lens is 20cm. f=20cm.

IT IS SURPRISING:  Who should wear glasses all the time?

## What is the focal length of double convex lens for which radius of curvature?

Hence, the focal length of the double convex lens is -60 cm.

## What is the focal length of double convex lens for which radius of curvature of either of the surface is 30 cm?

Answer: The focal length of a double convex length is 50 cm.

## What is the focal length of a double concave lens?

Hence, the focal length of a double convex length is 50 cm.

## What is a double concave lens?

Bi-Concave (Double-Concave) lenses have equal radius of curvature on both sides of the lens and function similarly to plano-concave lenses by causing collimated incident light to diverge.

## What is the focal length of double concave lens kept in air with two spherical surfaces of radii?

Answer: -36 cm. Explanation: kindly go through the solution.

## What is the focal length of a double concave lens with a radius of curvature 20 cm if the refractive index of glass with respect to the air is 5 3?

Given, focal length of the convex lens = f = 20 cm = 0.2 m.

## What are the two focal length of a double convex lens?

Double convex lenses have focal points on both sides of the lens; these and the points at twice the focal length are used to locate objects and images. When the object is outside 2F, the image will be between F and 2F on the other side and will be inverted, diminished, and real.

## What is the formula for double convex lens?

Determine the image distance. Multiplying both sides by 40x yields x+40=5x so 4x=40 and x=10.0 cm. An object 1.00 cm high is 8.00 cm to the left of a convex lens of 6.00 cm focal length.

IT IS SURPRISING:  Your question: Should you take sunglasses off when talking to someone?

## What is the focal length of concavo convex lens?

(Aus. 9.0 m ] The focal length of a concavo-convex lens of radii of curvature 5 cm and 10 cm is 20 cm.

## What is the lens maker’s formula?

Lens maker’s formula is the relation between the focal length of a lens to the refractive index of its material and the radii of curvature of its two surfaces. It is used by lens manufacturers to make the lenses of particular power from the glass of a given refractive index.

## Is focal length always positive?

The distance from the lens to the focal point is called the focal length. For converging lenses, the focal length is always positive, while diverging lenses always have negative focal lengths.