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The Hartl Optical Disk

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-444

2025-12-16

475

is so well adapted to the demonstration of the fundamental phenomena of light, that its use is recommended for class demonstrations. A dark room is not necessary, as the disk will show the phenomena in an ordinary room. Sunlight is the best source of light to use with it, but an arc lamp, an incandescent lamp, or a mantle lamp will do.

Demonstration. - Figure 1 shows the apparatus in use to demonstrate the laws of reflection from a plane mirror. The graduated scale and the semicircular sheet-metal screen are capable of rotating independently on the same axis. On. sending a beam of sunlight through the opening in the screen, letting the smaller beams strike upon a mirror fixed to the disk, and turning the disk until the beams strike at an angle to the zero line, it will be seen that the reflected beams make the same angle with the zero line, or normal, that the incident beams make with the same line.