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6. Monochromatic light strikes a thin film normal to the surface. On either side of the thin film is air. To obtain a reflected
minimum, the lowest (non-zero) thickness of the film must be

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7. Anti-reflective coatings on lenses use thin-film interference to eliminate the reflection of a particular color. Suppose a glass lens (ng = 1.5) is covered with a thin film (nf = 1.38) to prevent green light (λ = 531 nm) from being reflected. Part (a) Write an expression for the minimum thickness the film can have, t. Part (b) Calculate the minimum thickness, t, in nanometers?
4. What is the wavelength of light falling on double slits separated by 2.00 µm if the second- order maximum is at an angle of 60.0°? 5. Calculate the distance between two adjacent fringes for 633-nm light falling on double slits separated by 0.0800 mm, located 3.00 m from a screen.
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6. Structures on a hummingbird feather act like a diffraction grating having 8000 lines per centimeter. What is the angle of the first-order maximum for 488-nm light? 2 7. When red light illuminates a grating with 7000 lines per centimeter, its second maximum is at 62.4°. What is the wavelength of this light?
#21. In a single-slit experiment, light passes through the slit and forms a diffraction pattern on a screen 2.54 [m] away. If the wavelength of light is 655 [nm], and the width of the slit is 4.41 x 10-5 [m], find the linear distance on the screen from the center of the diffraction pattern to the first dark fringe. Upload Choose a File
8. Light of wavelength 6.0 × 10² nm falls on a double slit, and the first bright fringe of the interference pattern is observed to make an angle of 12° with the horizontal. Find the separation between the slits.
An air gap exists between two glass plates (n = 1.55). %3D a. Determine the minimum width of the air gap if orange light (495TH2) is strongly reflected. b. Determine the minimum width of the air gap if blue light (660TH2) is not reflected at all. c. Determine the minimum width of the air gap if orange light is strongly reflected AND blue light is not reflected at all.
10. Please refer to the Figure which shows the pattern of interference fringes for light of wavelength 609 nm passing through two narrow slits, projected onto a screen a distance of 2.27 m away. The distance on the screen between the centers of two adjacent bright fringes is 1.42 cm. What is the distance between the two slits? 7.79E-05 m 9.74E-05 m 1.75E-04 m 1.27E-04 m