Transverse waves and light

Measurement of wavelength from Young’s experiment

Measurement of wavelength from Young’s experiment Fig. 26.14 shows the ray geometry for the first bright fringe next to the central one. For clarity the vertical scale of this diagram has, like the others, been greatly exaggerated: actually the fringe spacing x is only about one six-hundredth of the distance D. We saw in the previous section that …

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Production of interference fringes using Young’s slits

Production of interference fringes using Young’s slits Fig. 26.12 shows the general scheme of a modern version of Young’s experiment. Two very narrow, close, and parallel slits S 1 and S2 are illuminated by the light from a single slit S parallel to them, and placed in front of a strong monochromatic (= one colour or wavelength) light …

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Interference

Interference When two ball-ended dippers are attached to the vibrator of the ripple tank, two sets of circular ripples are sent out which pass through one another as shown in Fig. 26.10. Where the two waves are superposed in the same phase, e.g., crest on crest, we get lines of increased disturbance or constructive interference. These are …

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Diffraction

Diffraction Interesting and unexpected results are obtained when straight waves are incident on an opening formed between two vertical metal barriers placed in the ripple tank. If the opening is a wide one compared with the wavelength of the waves, they will pass through in parallel straight lines, though we cannot fail to notice a slight bending round at …

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Refraction of waves at curved boundaries

Refraction of waves at curved boundaries When carrying out experiments on refraction, using very shallow water, it will be found that a very slight trace of detergent in the water will improve the results by reducing surface tension effects. The wave-focusing action of a shallow lens-shaped patch of water may be studied by placing a bi-convex piece of perspex …

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