To view an object in any type of mirror, a person must sight along a
line at the image of the object. All persons capable of seeing the image
must sight along a line of sight directed towards the precise image
location. As a person sights in a mirror at the image of an object,
there will be reflected rays of light coming from the mirror to that
person's eye. The origin of this light ray is the object. A multitude of
light rays from the object are incident on the mirror in a variety of
directions. Yet as you sight at the image, only a small portion of these
rays will reflect off the mirror and travel to your eye. To see an
object in a mirror, you must sight at the image; and when you do
reflected rays of light will travel from the mirror to your eye along
your line of sight.
Not all people who are viewing the object in the mirror will sight along the same geometrical line of sight. The precise direction of the sight line depends on the location of the object, the location of the person, and the type of mirror. Yet all of the lines of sight, regardless of their direction, will pass through the image location. In fact, the image location is defined as the location where it seems to every observer as though light is coming from. Since all people see reflected rays of light as they sight at an image in the mirror, then the image location must be the intersection point of these reflected rays.
In the animation above, an object is positioned in front of a plane
mirror. The plane mirror will produce an image of the object on the
opposite side of the mirror. The distance from the object to the mirror
equals the distance from the image to the mirror. Any person viewing
this image must sight at this image location. The animation depicts the
path of several rays of light from the object to the mirror. This light
subsequently reflects such that observers could sight along a line of
sight and view the image. Different people might sight from different
locations; yet each person would sight at the same image location. As
seen in the animation, the image location is the intersection point of
all the reflected rays.
Not all people who are viewing the object in the mirror will sight along the same geometrical line of sight. The precise direction of the sight line depends on the location of the object, the location of the person, and the type of mirror. Yet all of the lines of sight, regardless of their direction, will pass through the image location. In fact, the image location is defined as the location where it seems to every observer as though light is coming from. Since all people see reflected rays of light as they sight at an image in the mirror, then the image location must be the intersection point of these reflected rays.
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