Discussion
An integrating sphere is coated internally with a material chosen for
Answer: D
Correct answer: high and uniform diffuse reflectance across the spectrum
The sphere works by multiple diffuse reflections, so the coating must scatter rather than mirror, must reflect nearly all the light so that little is lost in the many bounces, and must do so equally at every wavelength. Any spectral structure in the coating would be multiplied by all those reflections and would colour every reading.
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