An air wedge is formed between two glass plates separated at one edge by a very fine wire. When the wedge is illuminated from above by a red light, many fringes are observed. The radius of the wire can be calculated from the number of fringes.

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Interference pattern in a wedge shaped case
Designed by Fu-Kwun Hwang (http://www.phy.ntnu.edu.tw/ntnujava/)
Deptartment of Physics, National Taiwan Normal University, Taiwan