Experimental Science; An Elementary Course of Physics And Chemistry
Experimental Science; An Elementary Course of Physics And Chemistry
Gregory, Richard, Sir, 1864-1952
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speaking of a uniform medium), there is no reason why we should not. Or, again, every one knows that it is only necessary to put a small obstacle in the path of the light from a luminous body to completely shut out our view of it. The light from the setting sun, when the sky is cloudy, is often seen to travel in straight lines. The Images Produced by a Pin-hole are Inverted.— When an object is viewed through a pin-hote camera, it is seen to be upside down upon the screen. Similarly, all images ...produced by a small aperture are inverted. This inversion is a direct consequence of the fact that light travels in straight lines. That this is really the case can be fully understood by the following simple considerations. Let H, in Fig. i6i, be the pin-hole, and AB the candle. Rays are sent out in all directions by every point of the candle, but of 'all the rays from any point, such as A, only that in the direction AH can pass through the hole and form an image A'. Simi- larly, the only ray from B which can get through the hole is BH, so an image of B is formed at B'.
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