Exam 16: Diffraction Patterns and Polarisation

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Light from a helium-neon laser ( λ\lambda = 632.8 nm) is incident upon a 0.200-mm wide slit.Find the total width of the central maximum 2.00 m from the slit.

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The spacing between reflecting planes in a crystal is 2.82 * 10-10 m.A beam of X-rays is strongly reflected at an angle of 160 °\degree with the crystal face.What is the wavelength of the X-rays?

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A binary star system in the constellation Orion has an angular separation between the two stars of 1.2*10-5 radians.If λ\lambda = 5 *10-7 m, what is the smallest aperture (diameter) telescope that may be used to resolve the two stars?

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Jane's flashy boyfriend has just given her a ring with a huge 'diamond'.Jane, who has studied physics, measures the polarising angle for the stone and finds that the polarising angle is 62.97 °\degree .The stone is:

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