1. If 580-nm light falls on a slit 0.05 mm wide, what is the full angular width of the central
diffraction peak?
2. A single slit 1.0 mm wide is illuminated by 450-nm light. What is the width of the central
maximum (in cm) in the diffraction pattern on a screen 7.0 m away?
3. Monochromatic light of wavelength 655 nm falls on a slit. If the angle between the first bright
fringes on either side of the central maximum is 32?
, estimate the slit width.
4. A He-Ne gas laser which produces monochromatic light of a known wavelength ? =
6.35 ? 10−7 ? is used to calibrate a reflection grating in a spectroscope. The first-order
diffraction line is found at an angle of 22?
to the incident beam. How many lines per meter are
there on the grating?
5. Light of wavelength 520nm falls on a slit that is 3.20 ? 10−3 ?? wide. Estimate how far the first
brightish diffraction fringe is from the strong central maximum if the screen is 10.0 m away.
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