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| Application of Plane Mirrors - Periscope |
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| It is an instrument in which plane mirrors are used to fold light so that the image of an object can be brought down to a lower level. It is used for observing enemy movements from trenches without any danger of being seen. Sailors on submarines use periscopes to see things above the water level. |
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| It consists of two parallel mirrors A and B facing each other and each fixed at 450 to the frame work. Rays of light entering through the aperture, strike the mirror A at an angle of incidence equal to 450 and are reflected along the axis of the tube, striking the mirror B at 450. From the mirror B, these rays are reflected parallel to their original path reaching the eyes of the observer. |
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