Framed Prints
Framed Print of The microscope; an introduction to microscopic methods and to histology
The microscope; an introduction to microscopic methods and to histology. Microscopes. 274 INDEX OF REFRACTION [Ch. IX greater than unity. Whenever the refractive index of a substance is given, the absolute index is meant unless otherwise stated. For ex- ample, when the index of refraction of water is said to be 1.33, and of crown glass 1.52, etc. these figures represent the absolute index, and the incident ray is supposed to be in a vacuum. § 448. Relative index of re- fraction. — This is the index of refraction between two contigu- ous media, as for example be- tween glass and diamond, wat. The microscope; an introduction to microscopic methods and to histology. Microscopes. 274 INDEX OF REFRACTION [Ch. IX greater than unity. Whenever the refractive index of a substance is given, the absolute index is meant unless otherwise stated. For ex- ample, when the index of refraction of water is said to be 1.33, and of crown glass 1.52, etc. these figures represent the absolute index, and the incident ray is supposed to be in a vacuum. § 448. Relative index of re- fraction. — This is the index of refraction between two contigu- ous media, as for example be- tween glass and diamond, water and glass, etc. It is obtained by dividing the absolute index of refraction of the substance containing the refracted ray, by the absolute index of the sub- stance transmitting the incident ray. For example, the relative index from water to glass is 1.52 divided by 1.33. If the light passed from glass to water it would be, 1.33 divided by 1.52. By a study of the figures showing refraction, it will be seen that the greater the re- fraction the less the angle and consequently the less the sine of the angle, and as the refraction between two media is the ratio. Fig. 156. Refraction of Light nsr Passing from Glass to Air. N Normal to the refracting surface. sin i In this case sin 34° 45 or 0.56975 sin r In this case sin 60° or 0.86603 _ I I-S2 If fig. 155 and 156 are compared it will be seen that the ray of light follows exactly the same path in leaving the denser me- diimi that it took on entering it. of the sines of the angles of incidence and refraction, it win be seen that whenever the sine of the angle of refraction is increased by being in a less refractive medium, the index of refraction will show a corresponding decrease and vice versa. That is, the ratio of the sines of the angles of incidence and refraction of any two contiguous substances is inversely as the refractive indices of those substances. The formula is: /Sine of angle of incident ray _ /Index of refr. © The Book Worm
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Media ID 41600705
Bookcentury1900 Bookdecade1910 Bookyear
Modern Frame 14"x12" (36x31cm)
Ready to Hang Contemporary Framed Prints adds style, protection, and a polished touch to your space - effortlessly.
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Wood effect frame, card mounted, 10x8 fade resistant photo print. Overall outside dimensions 14x12 inches (36x31cm). Environmentally and ozone friendly, 40mm wide x 15mm Polycore® moulding has the look of real wood, is durable and light and easy to hang. Biodegradable and made with non-chlorinated gases (no toxic fumes) it is efficient; producing 100 tons of polystyrene can save 300 tons of trees! Prints are glazed with lightweight, shatterproof, optical clarity acrylic (providing the same general protection from the environment as glass). The back is stapled hardboard with a sawtooth hanger attached. Note: measurements provided are estimated outer dimensions, which include both the image and the frame. While we aim to keep sizing consistent, exact dimensions may vary slightly due to differences in print size or production requirements, which may result in a variation in the overall size (up to approximately 2.5cm (1"))
These are individually made so all sizes are approximate
Estimated Image Size (if not cropped) is 24.4cm x 17.3cm (9.6" x 6.8")
Estimated Product Size is 36cm x 31cm (14.2" x 12.2")
