Mirror Free
Dec 21
2008
2008
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If the mirror turns through 20 degrees, through what angle does the reflected ray turn?
A horizontal rat of light falls on a vertical plane mirror free to turn about a horizontal axis. If the mirror turns through 20 degrees, through what angle does the reflected ray turn? Explain please. 
The easiest way to deal with this is to start by supposing that the ray is perpendicular to the mirror at the start. In this case, the reflected ray will also be perpendicular to the mirror. If the mirror now rotates through a 20° angle, it means that the original ray is making a 20° angle of incidence to a perpendicular (normal) to the mirror. By the law of reflection, the reflected ray must also make a 20° angle with the normal. The angle from the incident ray to the normal plus the angle from the normal to the reflected ray is 40°.
iPhone 4 で鏡になるアプリ、 Mirror Free
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