Consider a set of two plane glass plates that are placed on top of one another in such a way that they form a thin wedge of air between them. Calculate the required wedge angle between the plates to observe 10* interference fringes per meter when a light of wavelength 5000 A° incident normally on the plates. Answer Choices: a. 0.20° b. 0.18% ©. 0.14% d. 0.16°

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