## Heat and Light: An Elementary Text-book, Theoretical and Practical for Colleges and Schools |

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absorbed air thermometer amount angle of incidence apparatus aqueous vapour axis body boiling Boyle's Law bulb c.cm calorimeter candle Centigrade centimetre centre coefficient of dilatation coefficient of expansion colour column concave lens concave mirror convex lens cooled copper density dew-point distance diverging emitted equal experiment Fahrenheit fall flame focal length given grammes heat of fusion height Hence illumination image formed incident ray increase latent heat lenses liquid luminous magnifying power mass measured melting mercury metal normal observed parallel passes pencil of rays placed plate position principal focus prism produced quantity of heat radiant energy radiation raised ratio real image reflected rays reflexion refractive index retina rise of temperature saturation pressure scale screen shew shewn in fig slit specific heat spectrum steam substance surface telescope thermopile tube vertical vessel violet virtual image volume

### Popular passages

Page 53 - When a ray of light passes from one medium to another, it is refracted so that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the velocities in the two media.

Page 103 - The magnifying power of a simple microscope is the ratio of the size of the image to the size of the object.

Page 105 - Law, (the volume of any given mass of gas will be inversely proportional to its absolute pressure provided the temperature remains constant) and Charles Law, (the volume of a given mass of gas at constant pressure is proportional to its absolute temperature).

Page 157 - Hence the magnification, as thus defined, is measured as before by the ratio of the size of the image to that of the object, when the image is at the least distance of distinct vision.

Page 220 - The combustion of a gramme of coal produces 8000 units of heat. If an engine employs in pumping water one-tenth of the energy supplied to its boiler by the combustion of coal, find how much coal must be burnt in order to enable it to raise 5000 litres of water to a height of 10 metres. 6. Explain how the mechanical equivalent of heat may be calculated from a knowledge of the specific heats of air at constant pressure and constant volume.

Page 34 - The ratio of the quantity of heat required to raise the temperature of a given mass of any substance 1° to the quantity of heat required to raise the temperature of an equal mass of water 1° is called the specific heat of the substance.

Page 14 - ... is inversely proportional to the square of the distance of the point from the source.

Page 66 - ABC, fig. 46, be a section of a prism of glass, the angles at A and B being each 45°. Consider a ray falling normally on the face AC, it enters the glass and is incident on AB at an angle of 45°, which is greater than the critical angle. All the light therefore is totally reflected and emerges in a direction perpendicular to the face BC. In this case the reflected...

Page 53 - REFLEXION. (1) The incident ray, the normal to the surface at the point of incidence, and the reflected ray lie in one plane. (2) The angle between the reflected ray and the normal is equal to that between the incident ray and the normal.

Page 107 - Determine the size and position of the image. 8. Define the focal length of a spherical reflecting surface. How far from a concave mirror of radius 3 feet, would you place an object to give an image magnified three times ? Would the image be real or virtual ? 9.