Optics. Thomas Jung

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The Most well-known experience on an interference, it idle time, is an experience the Ship's boy on an interference of light from two cracks. Thomas Jung (1773-1829) has understood that it is impossible to expect interferentsionnyh effects from two independent beams of light and consequently in 1807 has put the following experience. It has passed a sunlight in a dark room through an aperture made a sharp needle, having received thus a dispersing beam of light. In the middle of a bunch it has placed a strip of a paper in width about millimetre which has divided a bunch on two parts. Then Ship's boys were put on a way of light by the screen and has found out on it equidistant strips - in the centre white, and along the edges painted, - imposed on frenelevu difraktsionnuju a picture. When it shifted a paper strip to edge of a primary bunch, strips disappeared. Ship's boys has done also other experiences to be convinced that the effect arises.

Simplicity and persuasiveness of experience the Ship's boy have played a huge role in support of works of Frenelja under the wave theory. Simple experiments are always more convincing, than difficult as the more equipments, the there are more than possibilities for occurrence of false effects. Simple installation with a clear principle of action is much more preferable.

Other big advantage of experience the Ship's boy was that it without any difficulties can be made quantitative. Frenelevu diffraction too can be counted quantitatively, but only by means of difficult mathematics; strips the Ship's boy are described by very simple theory. They can be used for measurement of lengths of waves of light, receiving results with accuracy approximately to 1%.

Great experiments in the physicist seldom happen ' closed '; they lead to new ideas and new experiments. Experience the Ship's boy is in this respect quite indicative. It has induced Arago and Frenelja to make experiments on an interference of polarised light in which it has been finalised that light represents movement of cross-section waves.