Light: A Series of Simple, Entertaining, and Inexpensive Experiments in the Phenomena of Light, for the Use of Students of Every AgeD. Appleton, 1877 - 112 páginas |
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Página 75
... focus . You can readily remember this word , because it means a hearth , or burning - place , and we saw our match ... focus glows with intensely white light , and presently begins to smoke and burn in the concen- trated heat . This bowl ...
... focus . You can readily remember this word , because it means a hearth , or burning - place , and we saw our match ... focus glows with intensely white light , and presently begins to smoke and burn in the concen- trated heat . This bowl ...
Página 76
... focus , and then all pass each other and go on in their previous direc- tions ; and you can readily see that a new cone of light will be formed , upside down , above the focus ; and beyond it all the rays will spread out wider and wider ...
... focus , and then all pass each other and go on in their previous direc- tions ; and you can readily see that a new cone of light will be formed , upside down , above the focus ; and beyond it all the rays will spread out wider and wider ...
Página 78
... focus . This focus consists of points , each of which is formed by the conver- gence of rays which come from a similar point in the window . This we call a projection , because the light is projected or thrown upon the wall by the lens ...
... focus . This focus consists of points , each of which is formed by the conver- gence of rays which come from a similar point in the window . This we call a projection , because the light is projected or thrown upon the wall by the lens ...
Página 79
... focus . Those from the top of the window are refracted in one direction , those from the bottom in another , and thus they cross each other , and the projected image of the window appears to be upside down . • The picture on page 77 in ...
... focus . Those from the top of the window are refracted in one direction , those from the bottom in another , and thus they cross each other , and the projected image of the window appears to be upside down . • The picture on page 77 in ...
Página 87
... focus . It is again refracted in the small glass of water , and is reflected by the mirror on the screen . Get a piece of smoked glass , and trace upon it some letters , and then lay it on the water - lens with the top ( upper side of ...
... focus . It is again refracted in the small glass of water , and is reflected by the mirror on the screen . Get a piece of smoked glass , and trace upon it some letters , and then lay it on the water - lens with the top ( upper side of ...
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Términos y frases comunes
17.8 centimetres angle of incidence Animals appear beam of light beam of reflection beam of sunlight beautiful black mirror block of wood blue BOND STREET bright candle centi centre CHARLES BARNARD circle cloth color color-top critical angle curious dark room diagram diameter direction disk distance dotted lines experiment falls fastened flask focus give glass gray paper heliostat hold hole Illustrations inch 25 millimetres inches 15.2 centimetres index of refraction lamp lantern light entering light passes look looking-glass magic lanterns metres mirror mucilage phenomena picture piece plano-convex lens point of incidence postal-card rays red square reflected light refraction represents ring screen shade shadow sheet shelf shine side slender beam slide slip slit smoke spot of light square stars straight surface things top spin tube wall water-lens wide window yellow
Pasajes populares
Página 3 - ... recommendation of this handy volume. The illustrations add to its interest and value, and its simplicity, both of design and execution, will commend it to beginners and others seeking information on the subject." From the Philadelphia Press. "It supplies a large number of simple and entertaining experiments on the phenomena of light, that any one can perform with materials that maybe found in any dwelling-house, or that maybe bought for a small sum in any town or city. This actually is philosophy...