Коэффициент просветности определяется по формуле:<img src="/close/store/examRes/%7B074C76EB-F206-4725-949D-F7AFEF1CB46A%7D/image084.gif" /><img src="/close/store/examRes/%7B074C76EB-F206-4725-949D-F7AFEF1CB46A%7D/image082.gif" /><img src="/close/store/examRes/%7B074C76EB-F206-4725-949D-F7AFEF1CB46A%7D/image083.gif" /><img src="/close/store/examRes/%7B074C76EB-F206-4725-949D-F7AFEF1CB46A%7D/image081.gif" /> <img src="/img/e3/2a16898f7b9455d5f3fd224951.gif" />, <img src="/img/c5/fcc67a01c9a44c82c24faeef53.gif" />, <img src="/img/f2/7031662648ca6dbc0013b19828.gif" />, <img src="/img/26/725ebc96e0aa2ca6f77fc037b4.gif" />