Poyasnenie: Pochemu oblaka kazhutsya takimi raznocvetnymi? Eto dovol'no redkoe yavlenie, nazyvaemoe raduzhnye oblaka, kotoroe poroi mozhet byt' mnogocvetnym, i inogda demonstrirovat' ves' spektr v odin moment. Eti oblaka sostoyat iz mel'chaishih vodyanyh kapelek primerno odinakovyh razmerov. Kogda Solnce nahoditsya pod opredelennym uglom i pochti skryto tolstymi oblakami, bolee tonkie oblaka prelomlyayut solnechnyi svet kogerentno, tak chto raznye cveta otklonyayutsya po-raznomu. Takim obrazom, luchi sveta razlichnyh cvetov prihodyat k nablyudatelyu s nemnogo raznyh napravlenii. Mnogie oblaka mogli by vyglyadet' kak raduzhnye i mogli by byt' raznocvetnymi, no okazyvayutsya slishkom tolstymi, libo slishkom peremeshannymi, libo slishkom daleko ot Solnca. Na segodnyashnei kartinke pokazany raduzhnye oblaka nad koloradskim gorodom Boulder, sfotografirovannye na proshloi nedele.

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