Physics

# Key Equations

PhysicsKey Equations

### 17.1Understanding Diffraction and Interference

 speed of light, frequency, and wavelength $c=fλ c=fλ$ change of wavelength with index of refraction $λ n = λ n λ n = λ n$ two-slit constructive interference $dsinθ=mλ dsinθ=mλ$, for m = 0, 1, −1, 2, −2, … two-slit destructive interference $dsinθ=(m+½)λ dsinθ=(m+½)λ$, for m = 0, 1, −1, 2, −2, … one-slit, first-order destructive interference; wavelength related to dimensions $Dy L =λ Dy L =λ$ one-slit destructive interference $Dsinθ=mλ Dsinθ=mλ$

### 17.2Applications of Diffraction, Interference, and Coherence

 wavelength change with change in medium $λ n = λ n λ n = λ n$ diffraction grating constructive interference $dsinθ=mλ dsinθ=mλ$ resolution $θ=1.22 λ D θ=1.22 λ D$

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