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DIFFRACTION

STANDING WAVE
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VIDEO OF DIFFRACTION EXPERIMENTS
AN APPLET WHICH DEMONSTRATES SINGLE SLIT DIFFRACTION: DIFFRACTION
diffraction_pattern.png
Diffraction can be understood with reference to Huygen's secondary wavelets or you can consider the different distances that rays diffracted by an object take.

diffraction_intensity.jpg
DIFFRACTION PATTERN VARIABLES SIMULATION



Sketch the variation with angle of diffraction of the relative intensity of light diffracted at a single slit.
diffraction_diagram.jpg


Derive the formula θ = λ/b for the position of the first minimum of the diffraction pattern produced at a single slit.

On the diagram below, the path difference is λ/2 for a minimum.
sinθ = λ/a. Using small angle approximation and IB notation, θ = λ/b

diffraction_minima_calculated.gif
Slit width is a here, in IB equation it is b


Solve problems involving single-slit diffraction.

OBSERVE DIFFRACTION IN WATER, SOUND AND LIGHT ON THIS SIMULATION:
PHET Wave Interference simulation