SAMPLE PROBLEMS Interference, Diffraction, Thin-Films, Polarization

# SAMPLE PROBLEMS Interference, Diffraction, Thin-Films, Polarization

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SAMPLE PROBLEMS Interference, Diffraction, Thin-Films, Polarization D. Finkenthal -1- Interference 1. If in a double-slit experiment the slit separation is increased, which of the following happens to the interference pattern shown on the screen? A. The maxima get closer together. B. The maxima stay at the same position. C. The minima and maxima stay at the same position. D. The minima stay at the same position. E. The maxima get further apart. 5. Interference of light is evidence supporting A. the wave theory of light. B. the wave theory except in the case of constructive interference. C. both the particle and wave theories of light. D. the particle theory of light. E. the wave theory except in the case of destructive interference. 3. Two beams of coherent light travel different paths arriving at point P. If the maximum constructive interference is to occur at point P, what should be the phase difference between the two waves? 4. Light from a monochromatic source shines through a double slit onto a screen 5.0 m away. The slits are 0.18 mm apart. The dark bands on the screen are measured to be 1.7 cm apart. What is the wavelength of the incident light? A. 457 nm B. 306 nm C. 392 nm D. 612 nm E. 784 nm 5. At the second maxima on either side of the central bright spot in a double-slit experiment, light from 6. If in a double-slit experiment the slit separation is increased, which of the following happens to the interference pattern shown on the screen? 7. Light of wavelength 575 nm falls on a double-slit and the third order bright fringe is seen at an angle of 6.5° from the central fringe. What is the separation between the double slits? A. 5.0 μm B. 10 μm C. 15 μm D. 20 μm E. 25 μm

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