A planoconvex lens of radius R and index of refraction n is placed curved side down on flat glass surface. This configuration is being used to measure the wavelength of light produced by a particular light source. If the radius of the dark rings produced by interference is r, what is the wavelength of the light? Assume the setup is in air

1. rn/mR
2. Rn/mr
3. mR/nr2
4. R2/mR


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Physics & Space Science

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