DoubleSlit - THE DOUBLE SLIT CAUTION: Do NOT look directly...

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12 THE DOUBLE SLIT CAUTION: Do NOT look directly into a laser beam or even a reflected beam!!!! Objective Measure the wavelength of a laser beam by generating a two-slit interference pattern. Theory The wave nature of light accounts for the interference observed when monochromatic light of wavelength λ is used to illuminate a pair of slits with spacing d . Rays 1 and 2 pass through the two slits. The rays interfere constructively when their path- length difference is an integer multiple of the wavelength. Under these conditions, d sin θ = m , (1) where m is an integer called the order of the interference maximum and is the angle which the rays make relative to the incident beam direction. The m th maximum will occur at the angle = d m m 1 sin . (2) If one observes an interference pattern and measures m , these equations can be used to measure d , if is known (or vice-versa). Rather than measure the angles of the diffraction maxima directly, we can project the
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DoubleSlit - THE DOUBLE SLIT CAUTION: Do NOT look directly...

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