0 a (6) A double-slit experiment is performed with light of wavelength 638.0nm. The bright interference fringes are spaced 2.09mm apart on the viewing screen. What will the fringe spacing be if the light is changed to a wavelength of 729.0nm? :] mes one " a (7) A transparent film (n = 1.27) is deposited on a glass plate (n = 1.52) to form a nonreflecting coating. The film has a thickness that is 1.08E7 m. What is the longest possible wavelength (in vacuum) of light for which this film has been designed? SubmitAnswer Tries 0/10 0 a (8) A soap film (n = 1.33) is 425.5 nm thick and lies on a glass plate (n = 1.52). Sunlight, whose wavelengths (in vacuum) extend from 380 to 750 nm, travels through the air and strikes the film perpendicularly. For which wavelength in this range does destructive interference cause the film to look dark in reflected light? :] Submit Answer Tries 0/10 " a (9) A double slit is illuminated simultaneously with orange light of wavelength 644.0 nm and light of an unknown wavelength. The m = 9.00 bright fringe of the unknown wavelength overlaps the m = 5.00 bright orange fringe. What is the unknown wavelength? :} SubmitAnswer Tries 0/10 0 a (10) Light from a sodium lamp of wavelength 468.0 nm illuminates two narrow slits. The fringe spacing on a screen 132.0 cm behind the slits is 7.85 mm. What is the spacing between the two slits? SubmitAnswer Tries 0/10 " a (11) Three sheets of plastic have unknown indices of refraction. Sheet 1 is placed on top of sheet 2, and a laser beam is directed onto the sheets from above so that it strikes the interface at an angle of 26.7deg with the normal. The refracted beam in sheet 2 makes an angle of 31.0deg with the normal. The experiment is repeated with sheet 3 on top of sheet 2 and, with the same angle of incidence, the refracted beam makes an angle of 36.2deg with the normal. If the experiment is repeated again with sheet 1 on top of sheet 3, what is the expected angle of refraction in sheet 3? Assume the same angle of incidence. :] SubmitAnswer Tries 0/10 Submit All This discussion is closed. &;'Send Feedback