Essentials of PhysicsAmerican Book Company, 1913 - 536 pages |
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Page 256
... rays are in a plane that is perpendicular to the reflecting surface . II . The angle of reflection is equal to the angle of incidence . Demonstration . Place two concave mirrors directly opposite each other , as at M and M ' ( Fig . 241 ) ...
... rays are in a plane that is perpendicular to the reflecting surface . II . The angle of reflection is equal to the angle of incidence . Demonstration . Place two concave mirrors directly opposite each other , as at M and M ' ( Fig . 241 ) ...
Page 423
... rays . In uses in which the red rays are required , as in the judgment of colors , the lamp is supplied with a trans- forming reflector which converts a portion of the violet rays into red and improves the quality of the light for such ...
... rays . In uses in which the red rays are required , as in the judgment of colors , the lamp is supplied with a trans- forming reflector which converts a portion of the violet rays into red and improves the quality of the light for such ...
Page 436
... rays from the same source is a pencil of rays . If these rays are parallel , they constitute a beam of light . If they diverge from a point , they form a diverging pencil . If they meet at a point , they form a converging pencil . As ...
... rays from the same source is a pencil of rays . If these rays are parallel , they constitute a beam of light . If they diverge from a point , they form a diverging pencil . If they meet at a point , they form a converging pencil . As ...
Page 438
... rays passing through a small opening is always inverted . That this must be so is shown by a study of Fig . 449 ... rays that are not parallel must cross in passing through it . The ray coming from the top of the object forms its image ...
... rays passing through a small opening is always inverted . That this must be so is shown by a study of Fig . 449 ... rays that are not parallel must cross in passing through it . The ray coming from the top of the object forms its image ...
Page 443
... ray of light is re- flected according to the law of reflection , but the unevenness of the surface of the paper causes the reflected rays to scatter in various directions , as shown in Fig . 453 . FIG . 453 489. Reflection ...
... ray of light is re- flected according to the law of reflection , but the unevenness of the surface of the paper causes the reflected rays to scatter in various directions , as shown in Fig . 453 . FIG . 453 489. Reflection ...
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Common terms and phrases
amperes angle axis ball beaker binding posts body called candle power carbon cell center of gravity charge circuit coil color conductor convex lens copper cylinder Demonstration density diameter direction disk distance dynamo earth electric electroscope energy equal friction galvanometer gases give glass rod glass tube heat horizontal inch increase induction iron lamp lens lever Leyden jar light lines of force liquid machine magnet measure mechanical advantage mercury metal mirror molecules motion moving needle number of vibrations ohms parallel Pascal's Law passes pendulum piece piston plane plate pole position potential poundal pressure pump rays reflected refraction resistance result rotation scale sewing needle shown in Fig shows side sound spark specific gravity steam strike surface suspended temperature thermometer tion tone vapor velocity vertical vibrations volts wave length weight wheel wire zinc
Popular passages
Page 80 - Every particle of matter in the universe attracts every other particle with a force that varies directly as the product of their masses, and inversely as the square of the distance between them.
Page 49 - Change of motion is proportional to the impressed force and takes place in the direction of the straight line in which the force acts.
Page 81 - While the term gravitation is applied to the universal attraction existing between particles of matter, the more restricted term gravity is applied to the attraction that exists between the earth and bodies upon or near its surface. The law given above applies to gravity, provided that d is measured in a straight line from the center of the earth to the center of mass of the body. This line is called a vertical line, or sometimes a plumb line (from the Latin word plumbum, which means " lead "), as...
Page 186 - Jar, bent towards the negative side ; a pith ball, under similar circumstances, moves in the same direction ; when a charged Jar is placed under the receiver of an air pump, and the air is exhausted, a luminous cloud flows from the positive to the negative side, in whichever way the Jar is electrified.
Page 178 - The temperature remaining the same, the volume of a given mass of gas varies inversely as the pressure acting upon it. This may be expressed by the proportion V: V = P' : P, from which we get Pr=P'V, (42) ie PV= a constant quantity.
Page 148 - ... twenty years ago, sought to graft upon this basis a system of psychology ; and two years ago a second and greatly amplified edition of his work appeared. Those who...
Page 147 - A body immersed in a liquid is buoyed up by a force equal to the weight of the liquid displaced by it.
Page 282 - ... the specific heat of a substance is the number of calories required to change the temperature of 1 g.
Page 49 - Every body must persevere in its state of rest, or of uniform motion in a straight line, unless it be compelled to change that state by forces impressed upon it.
Page 446 - A'B = AB. This means that the image of a point in a plane mirror is on a perpendicular from the point to the mirror and as far behind the mirror as the object is in front of it.