HERE to see the animation in a separate window! Double-click on the image will start the animation a single click will stop it again. The outgoing waves on the right hand side interfere, constuctive and destructive interference alternating. The following animated picture shows the superposition of waves which have passed narrow slits in an obstacle.Ī plane wave moves towards an absorbing screen with two very narrow slits. Interference phenomena prove the wave nature of light. ![]() Light, electromagnetic waves, coherent and incoherent light Here we are interested mainly in colours resulting from diffraction and interference, i.e. It is seen that the length of the bright lines corresponds to the apparent diameter of the moon. Middle and right: Without the danger of dazzling glare, this can also be conveniently observed with the moon. This is a consequence of the wave nature of light behind an obstacle, waves always expand somewhat into the shadow region. Light is diffracted into the shadow region towards the camera. Though there is no straight ray from the sun to the "eye" of the camera, where the ruler hides the sun its edges are shining. Y_1 = A_0 \sin(k r - \omega t) \quad \textsf\) the phase difference \(\delta\) is proportional to the distance of the fringe from the midpoint of the interference pattern, \(X\).Left: A steel ruler is held before the sun such that the camera's lens is completely shaded. Mathematically, for two waves described by \(y_1\) and \(y_2\), we obtain the result shown below (from Equation (10.6)): Specifically, we found that the resultant wave has an amplitude which depends on the phase difference. In Section 10.2, we discussed the principle of superposition of two waves with the same frequency and wavelength in the context of forming a standing wave.
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