Calculate the angle of incidence of beam radiation on a plane surface titled by 45° from the horizontal plane and pointing 30° west of south located at mumbai at 1:30pm(IST) on 15 november .The longitude and latitude of mumbai are 72° 49` east and 18°54` north respectively .The standard longitude for IST is 81°44` east
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we know that incident are equal to beam of radiation
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