# Which mirrors have a focus point?

## Which mirrors have a focus point?

Concave mirrors A concave mirror, or converging mirror, has a reflecting surface that is recessed inward (away from the incident light). Concave mirrors reflect light inward to one focal point. They are used to focus light.

## What is the focus of plane mirror?

infinity
The focal length of a plane mirror is infinity as the image can be formed at an infinite distance inside the mirror. A plane mirror can be recognised as a spherical mirror of infinite radius of curvature. Focal length is half of the radius of curvature and hence it is infinity.

Where is the focal point in a mirror?

The focal point is the point in space at which light incident towards the mirror and traveling parallel to the principal axis will meet after reflection. The diagram at the right depicts this principle. In fact, if some light from the sun were collected by a concave mirror, then it would converge at the focal point.

How do you find the focal point of a mirror?

1. f:focal point.
2. R:the center of curvature.
3. i:distance between image and vertex(mirror’s center)
4. o: distance between object and vertex.
5. f=R2.
6. or.
7. 1f=1o+1i.
8. 1f=i+oi⋅o.

### Do plane mirrors focus?

The image formed by a plane mirror can either be virtual (meaning that the light rays do not actually come from the image) or real (meaning that the light rays do actually come from the image). However the focal length of a plane mirror is infinity; its optical power is zero.

### What is the focal length of a plane mirror Why?

(A plane mirror can be considered as a spherical mirror of infinite radius of curvature. Focal length is half of radius of curvature and hence it is infinity.

How do you find the focal length of a mirror?

By obtaining the Real image of a distant object at its focus, the focal length of the concave mirror can be estimated as shown in the diagram. The focal length of the convex mirror is positive, whereas that of the concave mirror is negative. The same can also be proved by using the mirror formula: (1/f = 1/v +1/u).

How do you find the focal point of a convex mirror?

The mirror has a focal point (F) that is located along the principal axis, midway between the mirror’s surface and the center of curvature. Note that the center of curvature and the focal point are located on the side of the mirror opposite the object – behind the mirror.

#### What is the focal length of a plane mirror what is the magnification of a plane mirror?

What is the magnification of a plane mirror? The focal length of a plane mirror is infinity. The magnification of a plane mirror is 1. + As the radius (and focal length) of a spherical mirror increases, the front surface gets more and more flat.