Colorless or white light as perceived by human eye actually consists of many colors or wavelengths of light. Shown here is a beam of white light passing through a diffraction grating. Diffracted light propagates along discrete directions, called diffraction orders. The zeroth order does not exhibit dispersion (white beam). The light diffracted into the +1 and -1 diffraction orders is dispersed (decomposed) into different colors. Also visible but faint are the +2 and -2 diffraction orders.
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TOP22291428
Source:
達志影像
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RM
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