13. [-/1 Points] DETAILS MY NOTES SERPSE10 36.A.0P.024. ASK YOUR TEACHER PRACTICE ANOTHER A light source shines light consisting of two wavelengths, 4, = 540 nm (green) and 4, = 450 nm (blue), on two slits separated by 0.130 mm. The two overlapping interference patterns, one from each wavelength, are observed on a screen 1.43 m from the slits. What is the minimum distance (in cm) from the center of the screen to a point where a bright fringe of the green light coincides with a bright fringe of the blue light? r - l 'cm Need Help? Submit Answer 14. [-/1 Points] DETAILS MY NOTES SERPSE10 36.A.0P.027. ASK YOUR TEACHER PRACTICE ANOTHER As shown in the figure below, two transparent acrylic plates touch each other at the right end, but are separated by a hair at the left end. @ Initially, air fills the gap between the plates. Light is incident on and normal to the surface of the plate, and when viewed from above, the reflected light has 78 dark fringes. If water, with an index of refraction of n = 1.33, replaces the air between the plates, what is the new number of dark fringes that appear? Your answer should be a whole number. (Assume that the plates are of uniform thickness, they are very thick compared to the wavelengths of visible light, and the index of refraction of acrylic is 1.50. Assume that the air gap thickness is comparable to visible wavelengths.) Need Help? Submit Answer 15. [-/4 Points] DETAILS MY NOTES SERPSE10 36.A.0P.028. ASK YOUR TEACHER PRACTICE ANOTHER A boy is playing with a bubble wand, which is a large rectangular wire frame that contains a soap film. The boy holds the wand vertically, which causes the film to be thinner at the top and thicker at the bottom, forming a wedge shape. Assume a thickness of essentially zero at the top. White light shines on the film with approximately normal incidence. The boy views the reflected light from the film and sees the first violet interference band at a distance of 3.00 cm from the top edge of the film. The index of refraction of the soap film is the same as that of water, n = 1.33, and the wavelength of violet light is 4 = 415 nm. (a) At what distance (in m) from the top edge of the film does the boy see the first red (4 = 699 nm) interference band? | em L (b} What is the thickness (in nm) of the soap film at the location of the first violet interference band? nm 4 4 What is the thickness {in nm) of the soap film at the location of the first red interference band? y nrm (c) What is the wedge angle of the film (in rad)? | rad Need Help? Submit