In the figure, a broad beam of light of wavelength 638 nm is sent directly downward through the top plate of a pair of glass plates touching at the left end. The air between the plates acts as a thin film, and an interference pattern can be seen from above the plates. Initially, a dark fringe lies at the left end, a bright fringe lies at the right end, and nine dark fringes lie between those two end fringes. The plates are then very gradually squeezed together at a constant rate to decrease the angle between them. As a result, the fringe at the right side changes between being bright to being dark every 17.3 s. (a) At what rate is the spacing between the plates at the right end being changed? (b) By how much has the spacing there changed when both left and right ends have a dark fringe and there are five dark fringes between them? Incident light (a) Number Units (b) Number Units >

In the figure, a broad beam of light of wavelength 638 nm is sent directly downward through the top plate of a pair of glass plates touching at the left end. The air between the plates acts as a thin film, and an interference pattern can be seen from above the plates. Initially, a dark fringe lies at the left end, a bright fringe lies at the right end, and nine dark fringes lie between those two end fringes. The plates are then very gradually squeezed together at a constant rate to decrease the angle between them. As a result, the fringe at the right side changes between being bright to being dark every 17.3 s. (a) At what rate is the spacing between the plates at the right end being changed? (b) By how much has the spacing there changed when both left and right ends have a dark fringe and there are five dark fringes between them? Incident light (a) Number Units (b) Number Units >

Similar questions

Coherent light of wavelength 500 nm traveling rightward from the left passes through a vertical screen with two thin slits that are a distance d = 0.0400 mm apart. After passing through the two slits, the light spreads out in light and dark spots on another vertical screen 70.0 cm away on the right. The first bright fringe, 8.75×10-3m adjacent to the central bright fringe, while the fifth bright fringe is 4.375×10-2m. Draw a ray diagram explaining the problem. Show the interfering rays traveling from the two slits on the left to the screen on the right.
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In the figure, a broad beam of light of wavelength 628 nm is sent directly downward through the top plate of a pair of glass plates touching at the left end. The air between the plates acts as a thin film, and an interference pattern can be seen from above the plates. Initially, a dark fringe lies at the left end, a bright fringe lies at the right end, and nine dark fringes lie between those two end fringes. The plates are then very gradually squeezed together at a constant rate to decrease the angle between them. As a result, the fringe at the right side changes between being bright to being dark every 16.3 s. (a) At what rate is the spacing between the plates at the right end being changed? (b) By how much has the spacing there changed when both left and right ends have a dark fringe and there are five dark fringes between them? Incident light TTT (a) Number Units (b) Number Units
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