A fine metal foil separates one end of two pieces ofoptically flat glass, as in Fig. 24–33. When light of wavelength 670 nm is incident normally, 24 dark bands areobserved (with one at each end). How thick is the foil? FIGURE 24-33 (a) Light rays reflectedfrom the upper and lower surfaces ofa thin wedge of air (between two glassplates) interfere to produce bright anddark bands. (b) Pattern observedwhen glass plates are optically flat;(c) pattern when plates are not so flat.See Example 24-10.Aв (а)|(b)(c)

Given: Wavelength λ=670 nm 24 dark bands

Answered: FIGURE 24-33 (a) Light rays reflected…

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