Diffraction, gratings, resolving power 2

# Diffraction, gratings, resolving power 2 - Diffraction...

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Physics 102: Lecture 20, Slide 1 Diffraction , Gratings, Resolving Power Physics 113 Dr. Renat Letfullin

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Physics 102: Lecture 20, Slide 2 Single Slit Diffraction Physics 113 Dr. Renat Letfullin
Physics 102: Lecture 20, Slide 3 Diffraction/ Huygens Every point on a wave front acts as a source of tiny wavelets that move forward. We will see maxima and minima on the wall. Light waves originating at different points within opening travel different distances to wall, and can interfere!

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Physics 102: Lecture 20, Slide 4 1 st minima Central maximum Physics 113 Dr. Renat Letfullin
Physics 102: Lecture 20, Slide 5 For many slits, maxima are still at    sin θ = m λ d Region between maxima gets suppressed more and more as no. of slits increases – bright fringes become narrower and brighter. 10 slits (N=10)    dsin θ intensity λ 2 λ 0 2 slits (N=2)    dsin θ intensity λ 2 λ 0 Diffraction Grating Peak location depends on wavelength! Physics 113 Dr. Renat Letfullin

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Physics 102: Lecture 20, Slide 6 N slits with spacing d Constructive Interference Maxima are at:    sin θ = m λ d * screen VERY far away θ Diffraction Grating Same as for Young’s Double Slit !
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