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Interference is the combination of two or more waves to form a composite wave, based on such principle. The idea of the superposition principle is illustrated in Figure 14.1.1. (d) . Figure 14.1.1 Superposition of waves. (b) Constructive interference, and (c) destructive interference.
Interference and diffraction are common phenomena intrinsic to wave propagation. Interference refers to the effects caused by the coherent addition of wave amplitudes that travel different paths. If such waves are in phase, the light intensity is enhanced; conversely if they are out of phase, the light is attenuated. Diffraction is the result ...
This set of pictures shows snapshots of the interference of identical waves emitted by two sources. From top to bottom, the wavelength steadily increases, while from left to right, the distance between the two sources increases (being zero in each picture on the far left).
Interference and Diffraction of Light. When two or more waves overlap at some point, they can add together so that the combined amplitude could be either greater or less than the amplitudes of the constituent waves. This effect is known as interference.
Single slit diffraction Consider barrier with width a. Observe interesting light patterns, projected on the screen, depending on the relative size of the slit width and the light’s wavelength. We’ll now derive this from interference, thinking of each element of the slit as a point source and adding up their interference effect.
DIFFRACTION AND INTERFERENCE. We now turn to a consideration of what happens when two light waves interact with one another. We assume that the intensities are low enough that the disturbances add vectorially. The question then becomes whether the two waves are in phase or out of phase.
In this exercise you will measure the light intensity as a function of distance along the difraction pattern. After measuring a full pattern you can measure the distance between the peaks and troughs of the data and use the measurements to find the width of the slit according to equation 1.
