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002_PHYS1C_W07_EX4

002_PHYS1C_W07_EX4 - Name Date 1 You illuminate two slits...

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Page 1 Name: __________________________ Date: _____________ 1. You illuminate two slits 0.50 mm apart with light of wavelength 555 nm and observe interference fringes on a screen 6.0 m away. What is the spacing between the fringes on the screen? A) 4.5 mm B) 3.3 mm C) 6.7 mm D) 10 mm E) 5.0 mm 2. If a thin soap film ( n = 1.36) reflects predominately red light (about 680 nm), then what is the minimum thickness of the soap film? A) 1.25 ? 10 –7 m B) 6.80 ? 10 –7 m C) 2.50 ? 10 –7 m D) 5.00 ? 10 –7 m E) None of these is correct. 3. You apply a material with n = 1.25 to a lens ( n g = 1.5) to make a nonreflective coating due to destructive interference at a wavelength (in a vacuum) of 555 nm. What is the minimum thickness of the coating that you need? A) 56 nm B) 110 nm C) 220 nm D) 280 nm E) 140 nm 4. An unpolarized beam of light is incident on a group of three polarizing sheets that are lined up so that the characteristic direction of each is rotated by 45º clockwise with respect to the preceding sheet. The fraction of the incident intensity I o that is transmitted is

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002_PHYS1C_W07_EX4 - Name Date 1 You illuminate two slits...

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