# Plane mirror

Flat mirrorflat mirrorsflat fold mirrorplanar mirrorplaneplane mirrors
A plane mirror is a mirror with a flat (planar) reflective surface.wikipedia
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### Mirror

mirrorslooking glassreflector
A plane mirror is a mirror with a flat (planar) reflective surface.
The most familiar type of mirror is the plane mirror, which has a flat surface.

### Mirror image

reflectionmirror imagesmirror-image
However, the image is a laterally-inverted "mirror image" of the object.
In geometry, the mirror image of an object or two-dimensional figure is the virtual image formed by reflection in a plane mirror; it is of the same size as the original object, yet different, unless the object or figure has reflection symmetry (also known as a P-symmetry).

### Virtual image

virtualvirtual objectvirtual objects
The image formed by a plane mirror is always virtual (meaning that the light rays do not actually come from the image), upright, and of the same shape and size as the object it is reflecting.

### Geometrical optics

geometric opticsray opticsgeometric
For flat mirrors, the law of reflection implies that images of objects are upright and the same distance behind the mirror as the objects are in front of the mirror.

### Plane (geometry)

planeplanarplanes
A plane mirror is a mirror with a flat (planar) reflective surface.

### Light

visible lightvisiblelight source
For light rays striking a plane mirror, the angle of reflection equals the angle of incidence.

### Ray (optics)

raysrayincident light
For light rays striking a plane mirror, the angle of reflection equals the angle of incidence.

### Reflection (physics)

reflectionreflectedreflective
For light rays striking a plane mirror, the angle of reflection equals the angle of incidence.

### Normal (geometry)

normalnormal vectorsurface normal
The angle of the incidence is the angle between the incident ray and the surface normal (an imaginary line perpendicular to the surface).

### Collimated beam

collimatedcollimationcollimated light
Therefore, the angle of reflection is the angle between the reflected ray and the normal and a collimated beam of light does not spread out after reflection from a plane mirror, except for diffraction effects.

### Diffraction

diffraction patterndiffractdiffracted
Therefore, the angle of reflection is the angle between the reflected ray and the normal and a collimated beam of light does not spread out after reflection from a plane mirror, except for diffraction effects.

### Real image

realimageimages
Virtual objects produce real images, however.

### Focal length

effective focal lengthfocal distancelimiting the focal range of the lens
The focal length of a plane mirror is infinity; its optical power is zero.

### Infinity

infiniteinfinitely
The focal length of a plane mirror is infinity; its optical power is zero.

### Silver

Agsilver orenative silver
A plane mirror is made using some highly reflecting and polished surface such as a silver or aluminium surface in a process called silvering.

### Aluminium

aluminumAlall-metal
A plane mirror is made using some highly reflecting and polished surface such as a silver or aluminium surface in a process called silvering.

### Silvering

silveredreflector – glasssilver-on-glass
A plane mirror is made using some highly reflecting and polished surface such as a silver or aluminium surface in a process called silvering.

### Tarnish

tarnishingturn green
The reflecting surface reflects most of the light striking it as long as the surface remains uncontaminated by tarnishing or oxidation.

### Redox

oxidationoxidizedreduction
The reflecting surface reflects most of the light striking it as long as the surface remains uncontaminated by tarnishing or oxidation.

### Plate glass

flat glassplate-glasssheet glass
Most modern plane mirrors are designed with a thin piece of plate glass that protects and strengthens the mirror surface and helps prevent tarnishing.

### Polishing

polishpolishedpolishes
Historically, mirrors were simply flat pieces of polished copper, obsidian, brass, or a precious metal.

### Copper

CuCu 2+ cupric
Historically, mirrors were simply flat pieces of polished copper, obsidian, brass, or a precious metal.

### Obsidian

dragonglassa mysterious black substanceglasses
Historically, mirrors were simply flat pieces of polished copper, obsidian, brass, or a precious metal.

### Brass

brasswaremanganese brassCartridge brass
Historically, mirrors were simply flat pieces of polished copper, obsidian, brass, or a precious metal.

### Liquid

liquidsliquid phaseliquid state
Mirrors made from liquid also exist, as the elements gallium and mercury are both highly reflective in their liquid state.