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5.1 What characteristics must the crystal structure of a solid have in order for optic modes to
exist? Is it possible for the phonon dispersion relations of solid to contain acoustic modes only?
s only? If
If,
so, what characteristics are required for the crystal structure?

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Problem 3: A laser beam is incident on two slits with separation d = 0.034mm A screen is placed L = 4.8 m from the slits . The wavelength of the laser light is lambda = 3250A; theta_{1} and theta_{2} are the angles to the first and second bright fringes above the center of the screen. Part A: Express sin(theta_{1}) in terms of d and Part b solve for the numerical value of y in meters Part c Express the distance between the two bright fringes on the screen, in terms of e_{1}; theta_{3} and Part D Express sin(theta_{2}) in terms of d and
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Please don't use the Chegg answer. We haven't discussed the phase difference equation 1. a. For the antireflective coating shown in the figure, how thick should the coating be to destructively interfere the incoming light and the reflected light (off the front of the glass) and why? Assume the light has a wavelength in air of 533 nm (green). b. What would the intensity be for 400 nm light and why? (Remember: intensity goes as the electric field squared!)
Saleh & Teich Problem 6.2-6 (Note: There is a sign error in S&T eq. (6.2-13) - the leading - sign should be a + sign.) 6.2-6 Retardation Associated with Total Internal Reflection. Determine the phase retardation between the TE and TM waves that is introduced by total internal reflection at the boundary between glass (n = 1.5) and air (n = 1) at an angle of incidence 0 = 1.20c, where is the critical angle.
The Rayleigh criterion provides a convenient way to describe the theoretical resolution (e.g. an ability to distinguish two bright objects ) of an optical system. The criterion states that two small bright sources of light can be resolved if the first diffraction minimum of the image of one source point just coincides with of further apart then the first maximum of another (see figure below). A converging lens, 22.8 mm in diameter, is used to form images of distant objects. Considering the diffraction by the lens, what angular separation must two distant point objects have in order to satisfy Rayleigh's criterion? Assume that the wavelength of the light from the distant objects is 640 nm. Provide your Page 1 answer in millidegrees (mdeg).
ANSWER #2 A-C from the image provided
The analysis of any two-point source interference pattern and a successful determination of wavelength demands an ability to sort through the measured information and equating the values with the symbols in Young's equation. Apply your understanding by interpreting the following statements and identifying the values of y, d, m and L. Finally, perform some conversions of the given information such that all information share the same unit. If two slits 0.100 mm apart are separated from a screen by a distance of 300 mm, then the first-order minimum will be 1 cm from the central maximum. y= ________ d=________ m=_______ L=________