#### Lens maker’s equation

## 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.

## What is the difference between lens formula and lens maker formula?

The Lens Maker’s Formula. The focal length of a lens depends on the refractive index of the lens and the radii of curvature. The lens maker’s equation is another formula used for lenses that give us a relationship between the focal length, refractive index, and radii of curvature of the two spheres used in lenses.

## What is r1 and r2 in lens maker 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.

## What are the 2 types of lens?

The two main types of lenses are:Convex Lens (Converging)Concave Lens (Diverging)

## What does Snell’s law state?

Snell’s law, in optics, a relationship between the path taken by a ray of light in crossing the boundary or surface of separation between two contacting substances and the refractive index of each. This law was discovered in 1621 by the Dutch astronomer and mathematician Willebrord Snell (also called Snellius).

## What is a lens maker called?

Noun. 1. lens maker – a worker who makes glasses for remedying defects of vision. optician. skilled worker, skilled workman, trained worker – a worker who has acquired special skills.

## What is the power of lens?

If a lens has a shorter focal length it is said to be more powerful. The power of a lens is defined as the reciprocal of the focal length. Lens power is measured in dioptres (D). Diverging (concave ) lenses have negative focal lengths, so they also have negative power values.

## Which lens can form real and virtual image?

While diverging lenses always produce virtual images, converging lenses are capable of producing both real and virtual images. As shown above, real images are produced when the object is located a distance greater than one focal length from the lens.

## What is thick lens formula?

The focal length of a thick lens in air can be calculated from the lensmaker’s equation: P=1f=(n−1)[1R1−1R2+(n−1)dnR1R2] P = 1 f = ( n − 1 ) [ 1 R 1 − 1 R 2 + ( n − 1 ) d n R 1 R 2 ] . The signs of the lens’ radii of curvature indicate whether the corresponding surfaces are convex or concave.

## Can radius of curvature negative?

The distance from the vertex to the center of curvature is the radius of curvature of the surface. If the vertex lies to the left of the center of curvature, the radius of curvature is positive. If the vertex lies to the right of the center of curvature, the radius of curvature is negative.

## WHAT IS lens maker formula for concave lens?

‘F’ and ‘C’ is the focus and centre of curvature of the lens respectively. Let us place an object XY in between the focus and the centre of curvature of the concave lens. Let –f be distance from the focus and the pole, -u be the distance from pole and the object, -v be the distance from image and the pole.

## What is a lens in the eye?

Lens. Focuses light rays onto the retina. The lens is transparent, and can be replaced if necessary. Our lens deteriorates as we age, resulting in the need for reading glasses. Intraocular lenses are used to replace lenses clouded by cataracts.

## What is a lens in physics?

A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (elements), usually arranged along a common axis.