What is a geometrical shadow? Give examples
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Answer:
The area of shade formed by the obstruction is called the geometrical shadow. ... Water waves, for example, trying to enter an opening in a harbor wall, do not continue in a straight line and the waves appear to spread out from the opening into the shadow of the harbor walls. This spreading out is called diffraction.
A geometrical shadow is the set of points, where drawing a line between points on the shadow and the source always in the line intersecting the corresponding point on the object (obstacle) , or the shadow of the object without any diffraction at the corners. Let AB be an obstacle towards a source of light.
example - The most striking examples of diffraction are those that involve light; for example, the closely spaced tracks on a CD or DVD act as a diffraction grating to form the familiar rainbow pattern seen when looking at a disc. ... When deli meat appears to be iridescent, that is diffraction off the meat fibers.