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# What is the Focal Length of a Plane Mirror?

A plane mirror is one of the most common types of mirrors used in everyday life. It is a flat piece of glass with a reflective coating on one side. It is used to create an image of an object by reflecting the light that hits it. The focal length of a plane mirror is the distance from the mirror to the point where the light is focused.

## How Does it Work?

When light hits the plane mirror, it reflects off the surface of the mirror and creates an image. The image is created because the light that hits the mirror is bent, or refracted. This bending of the light causes the light to be focused at a point on the opposite side of the mirror. The distance from the mirror to the point where the light is focused is the focal length of the mirror.

## How is the Focal Length Measured?

The focal length of a plane mirror can be measured using a variety of methods. The most common method is to use a ruler or other measuring device to measure the distance from the mirror to the point where the light is focused. Another method is to use a magnifying glass to view the image created by the mirror. This method can be used to determine the exact distance from the mirror to the point where the light is focused.

## What is the Use of Focal Length?

The focal length of a plane mirror is an important factor in determining the size and shape of the image that is created. It is also used to calculate the distance from the mirror to the image. This can be useful for determining the size and shape of an object that is reflected in the mirror. In addition, it can be used to calculate the magnification of the image created by the mirror.

### Conclusion

The focal length of a plane mirror is an important factor in determining the size and shape of the image that is created. It is also used to calculate the distance from the mirror to the point where the light is focused. Knowing the focal length of a plane mirror can be useful in a variety of applications, from determining the size and shape of an object to calculating the magnification of an image.