8. You know that light hitting a CD is diffracted into a rainbow. Let's use this fact toget a rough estimate of the spacing of the adjacent recording pits on the CD.Consider this to be just like a diffraction grating, and we will guess we get a reasonable diffraction angle of 10° for light of 500 nm. What must be the spacing|between those pits?

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Asked Dec 11, 2019
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8. You know that light hitting a CD is diffracted into a rainbow. Let's use this fact to
get a rough estimate of the spacing of the adjacent recording pits on the CD.
Consider this to be just like a diffraction grating, and we will guess we get a
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8. You know that light hitting a CD is diffracted into a rainbow. Let's use this fact to get a rough estimate of the spacing of the adjacent recording pits on the CD. Consider this to be just like a diffraction grating, and we will guess we get a

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reasonable diffraction angle of 10° for light of 500 nm. What must be the spacing
|between those pits?
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reasonable diffraction angle of 10° for light of 500 nm. What must be the spacing |between those pits?

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Expert Answer

Step 1

From Bragg’s law

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nl =2dsine Herenisthe orderaf diffraction, listhe wavedength,đistheangleaf dfferction and distheinterplanar distance.

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Step 2

Rearrange the equation in terms of d and substitute 500 nm for wa...

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пл sin 8 ´10, 500nm x Inm sin 10° = 2.88x 10mm

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