Chrissy Henderson
Physics Lab 4
Section 7, Wed. 12:20
7 April 2005
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View Full DocumentI. Objective
The purpose of Lab 4 is to investigate the diffraction of light. Light, by definition,
is a particle as well as a wave. For this lab, we will define light’s behavior as a wave. We
will be looking at the super positioning of two waves over one another, including the
properties of interference and destructive interference. Finally, we will examine the
characteristics of diffraction with a monochromatic light, i.e. a laser. Postlab calculations
include finding the width of a slit by
a
sinθ=λ, finding the wavelength using the equation
λ=dy/L, and calculating the wavelength of diffraction gradient by λ=yd/2L. The percent
errors will then be calculated.
II. Observations / Data
A. Exp. II.B.  Disks
a.
Observe center transparent and opaque disks.
i.
Transparent: Bright
ii.
Opaque: Bright
b.
Light is observed as being bright because of constructive interference,
where crests of the wave coincide with one another, reinforcing the
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 Fall '08
 hatch
 Diffraction, Light, Wavelength, single slit, diffraction gradient

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