本题目来源于试卷: The Wave Nature of Light，类别为 通用国际物理
[问答题]
When a compact disk (CD) is held at an angle in whi3nkzp,w x1j2pte light, the reflecto3aa ( uc/qcvu2tev3* ed light is a full spectrum (Fig. 24–56). Explain. What would you expect to see if monochromatic light was used/v3ea 2o (*avtcqc u3u?
参考答案:
There are many, many
circular tracks on a CD and each track is made up of a series of pits and high
spots. Light reflects very well off of
the high spots and not the low spots.
Thus, when you shine white light on a CD, each track is a slightly
different distance from you, and as the light reflects off of each track to
you, they each have a different path length.
Thus, you’ll basically see a colorful diffraction grating pattern. If a monochromatic light is used, you will
see a single-color interference pattern.
In other words, instead of seeing the full rainbow of colors spreading
out from the center of the CD (as shown in Figure 24-56), there would just be
several “spokes” of the same color as your source spreading out from the center
of the CD. The spacings of these
“spokes” can be used just like a diffraction grating to determine that the
track spacing on the CD is approximately 1600 nm.
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