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Figure 27.34 shows two glass slides illuminated by purewavelength light incident perpendicularly. The top slide touches the bottom slide at one end and rests on a 0.100-mm-diameter hair at the other end, forming a wedge of air.

How far apart are the dark bands, if the slides are 7.50 cm long and 589-nm light is used?

Angle shown
larger than
actual
1 2
Glass
Air
Glass
(a)
(b)
Figure 27.34 (a) The rainbow color bands are produced by thin film interference in the air between the two glass slides. (b) Schematic of
the paths taken by rays in the wedge of air between the slides.

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Angle shown larger than actual 1 2 Glass Air Glass (a) (b) Figure 27.34 (a) The rainbow color bands are produced by thin film interference in the air between the two glass slides. (b) Schematic of the paths taken by rays in the wedge of air between the slides.