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257-MP5 and MP6 Intro rev 1

257-MP5 and MP6 Intro rev 1 - MP5/MP6 Physical Optics PHY...

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MP5/MP6 Physical Optics PHY 257 In this lab you will complete the following tasks: a. Study the diffraction pattern from a single slit b. Study the diffraction pattern from a double slit c Study the diffraction pattern from a circular aperture c. d. Study the diffraction pattern from a grating S d h diff i f f h l e. Study the diffraction pattern from a square array of holes (page 1)
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MP5/Section V-1a: Diffraction from a single slit laser θ screen L Single slit Optical bench (top view) Use the setup shown in the figure above. Use a single slit with width W = 0 04 mm Use L = 200 cm Place a paper sheet on the width W = 0.04 mm. Use L = 200 cm. Place a paper sheet on the screen and trace the diffraction pattern shown in the figure below Single slit diffraction pattern (page 2a)
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Single slit diffraction pattern x x 1 n=1 x 2 n =2 O x -1 n= -1 x -2 n= -2 x -3 n= -3 x 3 n =3 The minima in intensity of the diffracted light I occur at for = 1, 2, 3,... If we plot versus n we get a straight line n n n L x n W x λ = ± ± ± x 1 x 2 x 3 x -1 x -2 x -3 with slope If we solve for we get: L S W W λ = L W λ = x for we get: exp exp Compare with the manufacturer's value of = 0.04 mm.
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