Thomas Young's sketch of two-slit diffraction, which he presented to the Royal Society in 1803 Sound waves can diffract around objects, this is the reason we can still hear someone calling us even if we are hiding behind a tree.ĭiffraction can also be a concern in some technical applications it sets a fundamental limit to the resolution of a camera, telescope, or microscope. Ocean waves diffract around jetties and other obstacles. All these effects are a consequence of the fact that light is a wave.ĭiffraction can occur with any kind of wave. A shadow of a solid object, using light from a compact source, shows small fringes near its edges. Diffraction in the atmosphere by small particles in it can cause a bright ring to be visible around a bright light source like the sun or the moon. This principle can be extended to engineer a grating with a structure such that it will produce any diffraction pattern desired the hologram on a credit card is an example. The most colorful examples of diffraction are those involving light for example, the closely spaced tracks on a CD or DVD act as a diffraction grating to form the familiar rainbow pattern we see when looking at a disk. The effects of diffraction can be readily seen in everyday life.
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