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Question 1 Question: Not complete A double-slit experiment is set up with two slits both with a slit width of a = 4.87um, the distance between their centres is d = 29.32um. It is illuminated with light with a wavelength ) = 765 nm. Marked out of 1.00 Part 1) Flag question Figure 1. The orange envelope shows the diffraction pattern, while the peaks of the blue function are the interference maxima. Please note, the figure provided is just an example (i.e. different values for a, d and )), do not use this figure to answer the questions below. At what angle. 0, is the first minimum in the diffraction pattern observed? 0 = Part 2) At what angle. 0, is the first maximum (after the central maximum) of the double slit interference pattern observed? 9 = Part 3) How many total interference maxima are there between the two first order diffraction minima? Give an integer answer. number of interference maxima: CheckQuestion 2 Question: Not complete Marked out of 1.00 Ray 1 P Flag question Ray 2 Figure 1. Incident light makes an angle 0 with a crystal surface. The crystal layers are a distance d apart. Light is incident on a crystal such that it makes an angle 0 with the crystal surface as shown in the diagram. The spacing between the crystal layers is d. Consider two rays. Ray 1 reflected off the top layer and Ray 2 reflected off the crystal plane a distance d below. At the two red crosses the rays are perfectly in phase and the path difference between them is 0. Part 1) Write an expression in terms of d and 0 for the path difference between the light reflected off the top layer of the crystal and the light reflected a distance d below. path difference = Part 2) Using this write a condition for constructive interference in terms of m (the order, a positive integer), ), d and 0. Part 3) For the case when d = 0.395 nm and > = 0.0580 nm (x-rays), what an s needed to observed the first order constructive interference? 9 = Check Previous page Next page