Part A If a soap bubble is 115 nm thick, what wavelength is most strongly reflected at the center of the outer surface when illuminated normally by white light? Assume that n = Express your answer to three significant figures and include the appropriate units. λ = LO 1 μA Value Units ?

Part A (Figure 1) shows a light wave incident on and passing through a thin soap film. Reflections from the front and back surfaces of the film create smaller waves (not shown in the figure) that travel to the left of the film, where they interfere. What is the thickness of the film in terms of the light wavelength inside it? Express your answer as a multiple of wavelength to two significant figures. Πνα ΑΣφ d = Submit Request Answer Part B Figure 1 of 1 Do the reflections from the film surfaces have a phase shift or not? O Reflections from the both surfaces of the film do not have a phase shift. Soap film Reflection from the right surface of the film has a phase shift while reflection f film does not have a phase shift. Reflection from the left surface of the film has a phase shift while reflection fro film does not have a phase shift. Incident wave Reflections from the both surfaces of the film have a phase shift. Submit Previous Answers

S Grades | Schoology x Schoology x + → C PS Links S bcps.schoology.com/common-assessment-delivery/start/7318232295?action=onresume&submissionId=1412172123 Dictoronary Spani... U5 L4 Show What You Know: Light Transmission and Co' + II EA When you designed your solar cooker earlier in the year, you needed to place a sheet of transparent material (plastic wrap/saran wrap) across the opening. This was an effective design element because transparent materials allow electromagnetic waves to be Desk 1 reflected absorbed refracted transmitted 1 R 자 Ο All B H [[]] 00 NO 2 3 4 5 Next▶> Sign out May 29

A 580 lines/mm diffraction grating is in an empty aquarium tank. The index of refraction of the glass walls is nglass = 1.50. A helium-neon laser (λ = 633nm) is outside the aquarium. The laser beam passes through the glass wall and illuminates the diffraction grating. Part A What is the first-order diffraction angle of the laser beam? Express your answer with the appropriate units. ► View Available Hint(s) 0₁ = Submit Part B Value 0₁ = Units 1.33)? What is the first-order diffraction angle of the laser beam after the aquarium is filled with water (nwater = Express your answer with the appropriate units. ► View Available Hint(s) Value ? Units ?

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Three polarizing filters are stacked, with the polarizing axis of the second and third filters at angles of 24.0° and 62.0°, respectively, to that of the first. If unpolarized light is incident on the stack, the light has an intensity of 69.5 W/cm² after it passes through the stack. Part A If the incident intensity is kept constant but the second polarizer is removed, what is the intensity of the light after it has passed through the stack? Express your answer with the appropriate units. I = Value W cm² www. Submit Previous Answers Request Answer ?

You (height of your eyes above the water, h = 1.80 m) are standing 2.00 m from the edge of a 2.50-m-deep swimming pool (Figure 1). You notice that you can barely see your cell phone, which went missing a few minutes before, on the bottom of the pool. The index of refraction of water at this temperature is 1.333. Part A How far from the side of the pool is your cell phone? Express your answer with the appropriate units. ? d = 1.841 m Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Provide Feedback gure 1 of 1 K2.00 m 2.50 m

2 Problem 2 Assume two adjacent interstellar gas clouds with known thickness dị and d2 found in front of an astronomical light source. Suppose that this source emits a beam of radiation with known specific intensity 1, as it enters the first cloud of interstellar gas. Calculate the specific intensity I, immediately after this beam has traversed the two clouds of gas. Assume that the densities (p1 and p2) and the opacities (k,1 and ky,2) are constant within the clouds and are known quantities and that these clouds possess no emissivity. (Note the relationship between the opacity and absorption coefficient a, = pk,. See Rybicki and Lightman eq. 1.22.) %3D