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Why red light is used for developing photo film in dark room?

April 26, 2017Dark developing Film light Mathematics photo Physics red Used

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Why red light is used for developing photo film in dark room?

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Red light is used as it falls in the visible region of the spectrum , it has the longest wavelength , therefore its frequency is low & by the relation E = hf where E corresponds to energy , its energy is also low ,therefore it does not affect the photo developing process .