31. A thin film of oil (n = 1.25) is located on smooth, W wet pavement. When viewed perpendicular to the pavement, the film reflects most strongly red light at 640 nm and reflects no green light at 512 nm. How thick is the oil film?
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- EM WAVES HAVING A WAVELENGTH OF λ = 480nm A PASS THROUGH A SINGLE SLIT AND PRODUCE THE PATTERN SHOWN AT RIGHT ON A SCREEN 0.60m BEYOND. THE DISTANCE FROM A To B IS 0.15m. FIND THE WIDTH, W, OF THE SINGLE SLIT. T BRIGHT II T 8White light hits the surface of a thin film (n = 1.6) perpendicularly. There is air on both sides of the membrane. The wavelengths 504 nm and 672 nm are missing from the reflected light. a) What is the minimum thickness of the thin film? b) Which wavelengths are strongly visible in the reflected light?3. The glass plates in the figure are separated by a thin round filament. When the top plate is illuminated normally with a light of wavelength 595 nm, the filament lies directly below the fourteenth order bright fringe. What is the diameter of the filament?
- 33. You have a laser (a monochromatic light source) and want to estimate the wavelength. You decide to use a reflective diffraction grating to do this. The light is incident on the grating at 20 degrees with respect to normal. Using a grating with a groove distance of 5 um, the first-order diffraction, is found at an angle of -12.5 degrees. Determine the wavelength of the source. a) 500 nm b) 628 nm c) 808 nm d) 946 nm e) None of the above 34. In Raman spectrometry, Stokes lines have a) lower energy than that of anti-Stokes scattering. b) equal energy to that of anti-Stokes scattering. ) higher energy than that of anti-Stokes scattering d) none of the above 35. Upon ionization of phenol in aqueous solution, maximal UV absorbance changes to longer wavelength. a) True b) False 36. It takes longer time to observe fluorescence than phosphorescence. a) True b) False 37. The vibrational motion of C-H stretching in ethylene as in the figure can be detected by a) IR. b) Raman. c) IR and Raman.…Yellow light (Ao = 560 nm) is NOT reflected in air by a thin film deposited on glass. If the thickness of the film is 100 nm and glass has a refractive index of nglass = 1.50, what is a possible value for the refractive index of the thin film? nair 1.00 100 nm Nthin film Nglass 1.50 O A. 1.1 оВ. 1.2 О С. 1.3 O D. 1.4A thin film of oil (n 1.45) is floating on a water surface (n = 1.33) and is illuminated from above by monochromatic light (A = 590 nm). For what thickness of the oil film will the reflected light be bright? (in nm) = OA: 48.3 OB: 60.4 OC: 75.5 OD: 94.4 OE: 118.0 OF: 147.5 OG: 184.4 OH: 230.5
- 532 nm light is used on a 10.8 cm air wedge to measure the thickness of a grain of sand. The distance between the centers of dark band 2 and dark band 8 is 0.22 cm. What is the thickness of the grain of sand in micrometers?A thin film of oil (n = 1.26) is located on smooth, wet pavement. When viewed perpendicular to the pavement, the film reflects most strongly red light at 640 nm and reflects no yellow light at 548 nm. How thick is the oil film? nm25. A soap bubble appears green (λ = 540 nm) at the point on its front surface nearest the viewer. What is the smallest thickness the soap bubble film could have? Assume n = 1.35. n=1.35- Incident ray. Reflected rays' Outside air n = 1.00 Bubble interior n = 1.00