An opal such as that shown in Figure 27.17 acts like a reflection grating with rows separated

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An opal such as that shown in Figure 27.17 acts like a reflection grating with rows separated by about 8 μm. If the opal is illuminated normally,

(a) At what angle will red light be seen and 

(b) At what angle will blue light be seen?

Data from figure 27.17

(a) (b)

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