In the figure, a broad beam of light of wavelength 590 nm is sent directly downward through the top plate of a pair of glass plates. The plates are 120 mm long, touch at the left end, and are separated by 43 um at the right end. The air between the plates acts as a thin film. How many bright fringes will be seen by an observer looking down through the top plate? Incident light Number i Units

In the figure, a broad beam of light of wavelength 660 nm is sent directly downward through the top plate of a pair of glass Link 2 5. The plates are 120 mm long, touch at the left end, and are separated by 69 um at the right end. The air between the plates acts as a thin film. How many bright fringes will be seen by an observer looking down through the top plate? Incident light Number Units

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beam of monochromatic light is incident on a single slit of width 0.560 mm. A diffraction pattern forms on a wall 1.20 m beyond the slit. The distance between the positions of zero intensity on both sides of the central maximum is 2.36 mm. Calculate the wavelength of the light. nm A helium-neon laser (A = 632.8 nm) is used to calibrate a diffraction grating. If the first-order maximum occurs at 20.1 Degree , what is the spacing between adjacent grooves in the grating? (In this problem, assume that the light is incident normally on the gratings.) pm White light is spread out into its spectral components by a diffraction grating. If the grating has 1 980 grooves per centimeter, at what angle does red light of wavelength 640 nm appear in first order? (Assume that the light is incident normally on the gratings.)