Physics Project: The diffraction kit
Aim: To determine the approximate value of l for red light using a diffraction kit.
Theory: Diffraction of light is one explanation of the wave theory of light. Francesco Grimaldi
first observed this type of behvaiour from light. However, Thomas Young was the scientist that
was able to derive a mathematical formula where l can be calculated. The original experiment
involved sending white light into a screen with two small holes to serve as point sources. The
light from these sources was then projected onto a screen and light and dark bands were
observed. The mathematical formula could then be used after taking certain measurements.
Equipment: Light source (Ray box), Red cellophane, Doubleslit slide, and Measuring rod (can
be already attached to Ray box.
Method:
1.
Set up the ray box and place red cellophane in clip so that it is over the bulb.
2.
Switch on ray box and stand approximately two meters away from the ray box, hold the
slide up to your eye and look through one of the double slit patterns into the light. Observe
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 Spring '12
 Parsons
 Diffraction, Light, Thomas Young, Francesco Maria Grimaldi

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