A 633 nm helium-neon laser puts out 5.00 W of power with a beam 4.80 mm in diameter. The beam is pointed directly at a pinhole which has a diameter of 1.10 mm. How many photons of light will travel through the pinhole per second? Assume that the intensity of the light is equally distributed across the whole area of the beam. number of photons per second: photons/s
You desire to observe details of the Statue of Freedom, the sculpture by Thomas Crawford that is the crowning feature of the dome of the United States Capitol in Washington, D.C. For this purpose, you construct a refracting telescope, using as its objective a lens with focal length 88.5 cm. In order to acheive an angular magnification of magnitude 5.79, what focal length fe should the eyepiece have? fe = cm
How long does it take, in minutes, for light to reach Saturn from the Sun, a distance of 1.482 x 10⁹ km? time: 79.3 Incorrect min
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