Interference

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Interference Diffraction

• Thin Film Interference
• Double Slit Experiment
• Single Slit Diffraction
• Resolution
• a. Of microscope
• b. Of human eye
• 5. Contrast

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Group Problem

• Light of 500 nm falls on two parallel slits, each
  of 0.005 mm width, that are separated by 0.1 mm.
• a) If the screen is 10m away from the slits,
  find the distance to the first diffraction
  minimum from the center of the diffraction
  pattern (optic axis).
• b) Find the distance from the optic axis to the
  first minimum in the interference pattern.
• c) How many bright fringes are there in the
  central maximum?

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Group Problem

• Using the wavelength of maximum sensitivity of
  the eye (550 nm) and a pupil size of 2 mm, find
  the minimum angular separation the eye can
  resolve according to the Rayleigh criterion.
• To what minimum separation distance does this
  correspond for two point sources of light 20 m
  away?
• Using a near point of 25 cm, what is the
  resolving power of the eye?
• To what separation on the retina does this
  correspond? Use a focal length of 2 cm for the
  eye.