Interference Effects (AQA A-Level Physics): Flashcards

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Interference Effects
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Laser function in double-slit experiment

Coherent light source

Double slit function

Creates two coherent sources

Wavelength formula (double-slit, using gradient GG)

λ=Gs\lambda = Gs where ss is slit separation

GG in wavelength formula λ=Gs\lambda = Gs

Gradient of fringe width vs distance graph

Initial distance DD in double-slit expt (m)

0.500 m

Laser safety hazard

Eye damage

Diffraction grating function

Creates multiple orders of interference

Angle formula for diffraction grating (order nn)

θn=arctan⁡(hnD)\theta_n = \arctan(\frac{h_n}{D})

Result of constructive interference

Bright fringes

Result of destructive interference

Dark fringes

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