![]() For each different distance, a different number of wavelengths fit into that path. ![]() Each slit is a different distance from a given point on the wall behind it. The pattern that results from double-slit diffraction is not random, although it may seem that way. (b) Pure destructive interference occurs when identical waves are exactly out of phase (shifted by half a wavelength). (a) Pure constructive interference is obtained when identical waves are in phase. Theoretical Constructive and Destructive Wave Interference: The amplitudes of waves add together. (c) When light that has passed through double slits falls on a screen, we see a pattern such as this. Wave action is greatest in regions of constructive interference and least in regions of destructive interference. (b) Double-slit interference pattern for water waves are nearly identical to that for light. We can only see this if the light falls onto a screen and is scattered into our eyes. These waves overlap and interfere constructively (bright lines) and destructively (dark regions). (a) Light spreads out (diffracts) from each slit because the slits are narrow. Practical Constructive and Destructive Wave Interference: Double slits produce two coherent sources of waves that interfere. It should be noted that this example uses a single, monochromatic wavelength, which is not common in real life a more practical example is shown in. This cancels out any wave and results in no light. Destructive wave interference occurs when waves interfere with each other crest-to-trough (peak-to-valley) and are exactly out of phase with each other. Without diffraction and interference, the light would simply make two lines on the screen.Ĭonstructive and Destructive Wave InterferenceĬonstructive wave interference occurs when waves interfere with each other crest-to-crest (peak-to-peak) or trough-to-trough (valley-to-valley) and the waves are exactly in phase with each other. Young’s Double Slit Experiment: Light is sent through two vertical slits and is diffracted into a pattern of vertical lines spread out horizontally. ![]() The pattern that resulted can be seen in. In his experiment, he sent light through two closely spaced vertical slits and observed the resulting pattern on the wall behind them. People did not accept the theory that light was a wave until 1801, when English physicist Thomas Young performed his double-slit experiment. ![]() Newton felt that color, interference, and diffraction effects needed a better explanation. But some people disagreed with him, most notably Isaac Newton. As we discussed in the atom about the Huygens principle, Christiaan Huygens proved in 1628 that light was a wave. The double-slit experiment, also called Young’s experiment, shows that matter and energy can display both wave and particle characteristics.
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