Tuesday, May 5, 2015

Types of Mirrors

Mirrors are classified by their shape. There are three shapes of mirrors; plane, concave, and convex.

Plane Mirrors



A plane mirror is a mirror that has a flat. When we look at plane mirrors, our reflection is right side up. The reflection is the same size as you are. Images in a plane mirror are reversed left to right.
In a plane mirror, our image appears to be the same distance behind the mirror as we are in front of it. This happens due to the light reflecting off the mirror. When this happens, our brain thinks the reflected light travels in a straight line from behind the mirror. the image formed by a plane mirror is a virtual image. A virtual image is an image through which light does not travel.

Concave Mirrors



A mirror that is curved inward is called a concave mirror. The appearances formed by concave mirrors differ from the images formed by plane mirrors. An image formed by a concave mirror depend \s on three things; optical axis, focal points, and focal length of the mirror.
Plane mirrors can only form virtual images. Concave mirrors also form virtual images. But they can also form real images as well. A real image is an image where light passes. A real image can be projected onto a screen, but a virtual image can not.

Convex Mirrors



A convex mirror is a mirror that curves outward. For example, when you look at your reflection in the back of a spoon, you will see that your image appears right side up and small.
The reflected rays do not cross in front of a convex mirror. The reflected rays then are extended behind the mirror to find the virtual image. All images formed by convex mirrors are virtual, right side up, and smaller than the original object.
These mirrors are useful because they make images of large areas.

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