What focal length eyepiece should he use
A telescope consists of a mirror with radius of curvature 6.5 m and an eyepiece. If an astronomer would like the telescope to have a magnification of 114, what focal length eyepiece should he use?
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Light of wavelength 679 nm is incident on a single slit. The central bright fringe is 2.75 cm wide on a flat screen that is 81.4 cm from the slit. What would be the width of the central bright fringe if the wavelength were 474 nm?
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