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Two thin symmetric glass lenses, one bic...

Two thin symmetric glass lenses, one biconvex and the other biconcave, are brought into contact to make a system with optical power `Phi = 0.50 D`. Newton's rings are observed in reflected light with wavelength `lambda = 0.61 mu m`. Determine:
(a) the radius of the tenth dark ring,
(b) how the radius of that ring will change when the space between the lenses is filled up with water.

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