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dichroic filter

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noun
an optical colour filter operating on the principle of wave interference between closely spaced reflecting surfaces, rather than by colour absorption
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Question 1 of 8
Which of the following words describes “sky blue”?
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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