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
4
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Resistance and Resistivity: A rod is 4.0 m long and has a square cross-section that is 1.5 cm on each side. An ohmmeter measures 0.040 ? across its ends. What is the resistivity of the material from which this rod is made?
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All but one of the following are necessary to create a functioning laser through stimulated emission. Which one is not necessary?
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