2. (a) A soap film is illuminated with white light. If the thickness of the film...
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2. (a) A soap film is illuminated with white light. If the thickness of the film is 630 nm and its refractive index is 1.34, calculate the wavelengths of light reflected on the surface. If this soap film is then coated on a glass surface what reflected wavelengths are present? Explain the difference between each situation above and the interference conditions. (6 marks) (b) In Newton's ring experiment a plano-convex lens is placed on a glass plate. The radius of the lens is 4.5 cm and its refractive index is 1.55. If 600 nm light illuminates the lens from directly above 52 bright fringes are counted from centre to edge of the lens. Calculate the radius of curvature and focal length of this lens. Explain why the fringe pattern observed. (7 marks) (c) Using phasor analysis calculate the resultant amplitude and phase of the addition of three phasors of the from E=2sin(at + 5/36), E = sin(wt + 25/36) and E3 = 3sin(wt + 13/36). (7 marks) 2. (a) A soap film is illuminated with white light. If the thickness of the film is 630 nm and its refractive index is 1.34, calculate the wavelengths of light reflected on the surface. If this soap film is then coated on a glass surface what reflected wavelengths are present? Explain the difference between each situation above and the interference conditions. (6 marks) (b) In Newton's ring experiment a plano-convex lens is placed on a glass plate. The radius of the lens is 4.5 cm and its refractive index is 1.55. If 600 nm light illuminates the lens from directly above 52 bright fringes are counted from centre to edge of the lens. Calculate the radius of curvature and focal length of this lens. Explain why the fringe pattern observed. (7 marks) (c) Using phasor analysis calculate the resultant amplitude and phase of the addition of three phasors of the from E=2sin(at + 5/36), E = sin(wt + 25/36) and E3 = 3sin(wt + 13/36). (7 marks)
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Related Book For
Fundamentals of Physics
ISBN: 978-0471758013
8th Extended edition
Authors: Jearl Walker, Halliday Resnick
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