Calculate the speed of light in the Foucault Method if the frequency of mirror rotation CW is 1450 rev/sec, frequency of CCW rotation is 1461 rev/s. Take the distance between the rotating mirror and fixed mirror to be 10.417m. The distance between the lens L2 and the rotating mirror is 55.1cm. The image displacement in the telescope when the mirror is going CW is 9.2mm and the image displacement when the mirror is rotating CCW is 8.57mm. The distance between two lenses L1 and L2 is 25.9cm. Focal length of L1 is 48mm.

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Photoconductive Cell

Photoconductive cells are light-sensitive resistors in which resistance is inversely proportionated to light intensity when illuminated. These devices consist of a thin single-crystal or polycrystalline film of composite semiconductor materials. Cadmium sulfide (CdS) is used to make the most commercially available photoconductive particles which are sensitive to light in the visible spectrum. Other less commonly used substances respond to infrared light, but not to the visible spectrum. Such substances are lead sulfide (PbS), lead selenide (PbSe), and lead telluride (PbTe), and so on.