You and your team need to determine the thicknesses of two extremely thin sheets of plastic and do..
You and your team need to determine the thicknesses of two extremely thin sheets of plastic and do not have a measurement instrument capable of the job. You fi nd a white light source with color fi lters (i.e., tinted glass windows that only let certain colors pass through) including red (𝜆 = 660 nm), green (𝜆 = 550 nm), and blue (𝜆 = 470 nm). You locate two glass microscope slides, each of length 10.0 cm, stack one on top of the other, and tape their ends together on one side. On the very edge of the side opposite the tape, you sandwich a piece of plastic between the slides to form a wedge of air between the plates. (a) When you shine blue light perpendicular to the slides, 55 bright fringes form along the full length of the slide. How thick is the plastic? (b) When you replace the fi rst sheet with the second sheet of plastic, the fringes that appear are too closely spaced to count. You switch to red light (a longer wavelength), and count 124 fringes. How thick is the plastic? (c) How many fringes would you expect in each case, (a) and (b), if you instead used green light? Apr 25 2022 08:12 PM
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