An air wedge is formed between two glass plates of length 10cm each
with a wire between them at one end. Using light of wavelength 589.3nm,
20 fringes per cm are seen. Calculate the radius of the wire.
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An air wedge is formed between two glass plates separated at one edge by a very fine wire of circular cross section as shown in Figure P37. 37. When the wedge is illuminated from above by 600-nm light and viewed from above, 30 dark fringes are observed.
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