1. Why does the pattem formed by the hair in the laser beam have a bright rather

Question

1. Why does the pattem formed by the hair in the laser beam have a bright rather than a dark center? 2. As between the double-slit, the single slit and the diffraction grating, which method provides for the most accurate determination of wavelength? Describe why, in a diffiction grating that consists of more slits the same distance apart as a comparable double slit, you see narrower and sharper maxima. 3. Now that you know the spacing between the pits that store information on the CD, calculate the information capacityof a CD? You may need to do some research for yourself to learn more about how CDs work.

Explanation / Answer

1] Because the hair can be modeled as a cylinder, light passing around it will meet at the center spot with the same path difference from either side (due to this symmetry). Therefore, light from both sides of the hair will interfere constructively at the center and give a bright spot rather than a dark spot.

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