| When light passes through a slit with a size that is close to the light’s wavelength, the light will diffract, or spread out in waves. When light passes through two slits, the waves from one slit will interefere with the waves from the other. Constructive interference occurs when a wavefront, or crest, from one wave coincides with a wavefront from another, forming a wave with a larger crest. Destructive interference occurs when a wavefront of one wave coincides with a trough of another, cancelling each other to produce a smaller wave or no wave at all. |
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