PHYS 101 1st Edition Lecture 36Outline of Last Lecture I. Wave OpticsOutline of Current Lecture II. Wave Optics continued…III. Practice ProblemsCurrent Lecture II. Wave Optics continued…A. X-ray diffraction by crystals 2 d sin θ = m ; where m = 1, 2, 3…Handout last time: Bright (constructive): path difference = m Dark (destructive): path difference = (m + ½) ; the distance depends on the apparatusYoung’s double slit: distance = d sin θ(for x-ray, it is 2 d sin θ)Bright: d sin θ = m Dark: d sin θ = (m + ½) III. Practice Problems A. #9 Monochromatic light falls on screen 1.75 m from 2 slits separated by 2.10 mm. The first and second-order bright fringes are separated by 0.552mm. What is the wavelength of the light? Y1 + (0.552/1000) = Y20.000552 = Y2 – Y1bright: d sin θ = m ; = ? These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.sin θ = Y/L d (Y/L) = m 1 st order m = 1 d (Y1/L) = (1) (2.10/1000) (Y1/1.75) = 2 nd order m=2 “Will complete next time…”d (Y2/L) = (2) (2.10/1000) (Y2/1.75) = 2
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