# Concept of Reflection Symmetry

#### definition

Reflection symmetry: Reflection symmetry is symmetry with respect to reflection. That is, a figure which does not change upon undergoing a reflection has reflectional symmetry.

# Reflection Symmetry:

The concept of line symmetry is closely related to mirror reflection.

Line symmetry and mirror reflection are naturally related and linked to each other. Reflection symmetry is symmetry with respect to reflection. That is, a figure which does not change upon undergoing a reflection has reflectional symmetry. The line symmetry is closely related to mirror reflection. When dealing with mirror reflection, we have to take into account the left ↔ right changes in orientation.

Write the English capital letters A, H, M in a large size on separate sheets of paper. Fold the paper so that their two parts fall exactly on each other. Mark dots the line which makes two equal parts of the figure. This line is the axis of symmetry of the figure. Some figures have more than one axis of symmetry.

If a symmetrical figure gets divided by an axis in the figure into two parts which fall exactly on each other, its symmetry is called reflectional symmetry.

The object and its image are symmetrical with reference to the mirror line. If the paper is folded, the mirror line becomes the line of symmetry. We then say that the image is the reflection of the object in the mirror line. You can also see that when an object is reflected, there is no change in the lengths and angles; i.e. the lengths and angles of the object and the corresponding lengths and angles of the image are the same

# Kaleidoscope:

A kaleidoscope uses mirrors to produce images that have several lines of symmetry (as shown here for example). Usually, two mirrors strips forming a V-shape are used. The angle between the mirrors determines the number of lines of symmetry.

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Reflection Symmetry [00:04:53]
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