HSC Physics Interference of Waves

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A tutorial sheet on double slit interference is given below.

  1. Coherent, monochromatic light passes through a single narrow rectangular slit. Describe the intensity pattern that forms on a screen at a large distance from the slit.
  2. Coherent, monochromatic light passes through two parallel narrow rectangular slits. Describe the intensity pattern that forms on a screen at a large distance from the slits.
  3. Coherent red light of wavelength 650 nm passes through a double slit of separation 0.2 mm. Determine the distance between successive bright fringes on a screen 3.0 m from the double slit.
  4. What is the path difference when the first order maximum forms on a screen?
  5. In a double slit experiment one of the slits is covered up. Is the central maximum brighter when one of the slits is covered?
  6. Microwaves have a wavelength of 3.0 cm. A micowave detector is placed alongside the microwave source. The microwaves are aimed perpendicular at thin parallel perspex and metal sheets. Some microwaves reflect back from the perspex and all are reflected back by the metal sheet. What is the least distance between the sheets when constructive interference occurs in the reflected microwaves?

HSC Physics Polarisation

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A tutorial sheet of polarisation problems is given below

  1. When is a beam of light polarised?
  2. A beam of unpolarised light of intensity 4000 Wm-2 strikes a polarising filter. What is the transmitted intensity?
  3. Unpolarised light of intensity I passes through three polarising filters placed in a line. The polarising directions of the filters are are inclined at 45° to each other. Determine the intensity transmitted by the third filter.
  4. Polarised light of intensity I passes through three polarising filters placed in a line. The angle between the plane of polaristion of the light and the polarising direction of the first filter is 45°. If the polarising directions of the filters are inclined at 45° to each other, determine the intensity transmitted by the third filter.
  5. Light is polarised with its electric field in the horizontal plane. The light strikes two polarising filters, one behind the other. The first filter has its polaring direction at 25° to the horizontal and the second at 50° to the horizontal. What percentage of the intensity of the original light passes through the second filter?