## WHAT IS lens short answer?

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.

## What are 2 types of lenses?

The two most common types of lenses are concave and convex lenses, which are illustrated below in Figure 1. A common bi-convex lens is considered a positive lens because it causes light rays to converge, or concentrate, to form a real image.

## WHAT IS lens formula?

What is Lens Formula? In optics, the relationship between the distance of an image (v), the distance of an object (u), and the focal length (f) of the lens is given by the formula known as Lens formula.

## What is the formula for concave lens?

In this equation, f is the focal length of the lens, while v refers to the distance of the formed image from the lens’ optical centre. Lastly, u is the distance between an object and this lens’ optical centre.

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

What is the difference between Real and Virtual Image?…Difference between Mirror and Lens.MirrorLensA mirror can be plane or spherical (concave or convex)A lens is usually curved from either one or both surfaces.Mirror formula is 1/f = 1/v + 1/uLena formula is 1/f = 1/v – 1/u2 •

## What is difference between mirror and lens?

Differences between lenses and mirrors Light reflects from a mirror. Light goes through, and is refracted by, a lens. Lenses have two focal points, one on either side of the lens. A concave mirror converges light to a focal point.

## Which lens is used in plane mirror?

2) Concave Lens:MirrorLensIt reflects the light that falls on its surface.It refracts the light. Convex lens converges and concave lens diverges the light.It can be plane or spherical.It has two surfaces out of which one is curved inwards or outwards.3

## What is Mirror formula in physics?

A mirror formula can be defined as the formula which gives the relationship between the distance of object ‘u’, the distance of image ‘v’, and the focal length of the mirror ‘f’.

## What are 3 types of mirrors?

Three common types of mirror are the plane mirror, which has a flat, or plane, surface; the convex mirror; and the concave mirror.

## Is V positive in concave mirror?

➡ For convex mirrors, the image is always virtual. Let, u = object distance from pole of a mirror. ➡ When the image is virtual, then “u” is as it is negative, “v” is positive, ”f” is negative. THUS, IN CASE OF CONCAVE MIRROR, FOCAL LENGTH ALWAYS REMAINS NEGATIVE.

## What is the sign of concave mirror?

Since, object is always placed in front of the mirror hence the sign of object is taken as negative. Since, the centre of curvature and focus lie in front of the concave mirror, so signs of radius of curvature and focal length are taken as negative in the case of concave mirror.

## What are the uses of concave mirror?

Concave mirrors are used in reflecting telescopes. They are also used to provide a magnified image of the face for applying make-up or shaving.

## What is V and U in light?

if v is the image distance and u is the object distance. It can be also defined as the ratio of the height of the image to the height of the object.