A total of 26 bright and 26 dark newtons rings not counting, Ask an Expert

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Q. The length of a string is 298cm. It is held ?xed at each end. The string vibrates in four sections; i.e., the string has four antinodes, and the string vibrates at 110 Hz.

Find out the wavelength.

Q. A total of 26 bright and 26 dark Newton's rings (not counting dark spot at the center) are observed when 540 light falls normally on a planoconvex lens resting on a flat glass surface.How much thicker is the center than edges?

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