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8-inch lens A. C. GILBERT COMPANY absorbs air to water angle angle of incidence appear audience beam of sunlight blue camera candle power coin complementary color converging lens convex dark darkened room distance diverging lens edge equal exactly feet flame flected focal length front FUN BY DAY ghost Henry hold Hypnotist inches long Ladies and Gentlemen lamp lenses LIGHT EXPERIMENTS light Fig light passes light travels light waves look Lynde's Physics Macmillan Magic match means of light Morse code moves lips nail hole opera glass parallel rays parallel waves pencil periscope perpendicular picture piece of paper postcard prism published reflected beam reflected light refracted Repeat right side ring holder ruler screen seated sensation of sight shadow shown in Fig slant slit slowly spherical standard candle straight line surface telescope thumb tissue paper tube turn vertical water or glass window glass
Page 29 - The image seen in a mirror is always the same distance behind the mirror that the object is in front...
Page 17 - ... that the intensity of light varies inversely as the square of the distance.
Page 73 - Descartes notices — and this seems to be the first step in the reduction — that "the determination of this [anaclastic] line depends on the relation between the angle of incidence and the angle of refraction
Page 111 - The lenses are separated by a distance equal to the sum of their focal lengths and the magnification is the ratio of the focal lengths.
Page 88 - This is to be expected as we have already shown that white light is made up of all the colors of the spectrum from red to blue.
Page 28 - The image appears to be as far behind the mirror as you are in front of it.
Page 102 - If the object is at a distance from the lens greater than the focal length (1, Fig.