Question: Suppose the light striking the reflective diffraction grating in Figure 34.13 is white light-that is, light consisting of all the colors of the rainbow. Red

Suppose the light striking the reflective diffraction grating in Figure 34.13 is white light-that is, light consisting of all the colors of the rainbow. Red light has the longest wavelength of the colors that make up white light; violet has the shortest.

(a) Is the angle at which first-order constructive interference occurs for violet light less than, equal to, or greater than the angle for red light?

(b) Why are multiple rainbows visible in the reflected light?

$Figure 34.13 Reflective diffraction grating. path-length difference to observer$

Figure 34.13 Reflective diffraction grating. path-length difference to observer

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