University Physics Volume 3
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In a realistic two‑slit experiment, you see two interference effects described in this chapter. There is the large‑scale interference pattern from diffraction that depends on the width of each slit, and within that pattern there is the small‑scale interference pattern that depends on the separation distance between the slits.
For a slit width of 0.040 mm and a slit separation of 0.50 mm,what is the number n1 of bright two‑slit interference fringes that fit inside the central bright fringe of the diffraction pattern (from the first dark fringe on one side of the center to the first dark fringe on the other side) if the laser has a wavelength of 700 nm?
n1 = ?
For the same slit width and slit separation, what is the number n2 of bright two‑slit interference fringes that fit inside the central bright fringe of the diffraction pattern if the laser has a wavelength of 490 nm?
n2 = ?
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