The normal line is a line at a right angle (90 degrees) to the

To draw a normal line to the mirror, you must draw a line at 90 degrees to the surface of the mirror.

angle of refraction

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Measurement of angles

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Degrees (Angles)

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Right angle (90°); obtuse angle (more than 90° and less than 180

Types of Angles A right angle has a measure of 90 degrees. An