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a) In double-slit interference experiment, path difference Δ = d sin θ. Use ray diagram and...

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Physics

a) In double-slit interference experiment, path difference Δ = dsin θ. Use ray diagram and words to explain why bright spotslocated at where Δ = mλ and dark spots located at where Δ=(m+1/2)λ.Here m = 0, ±1, ±2, ±3, etc.

b)Use any resource you can find to study the single-slitdiffraction. Explain how the diffraction pattern formed by laserlight passing a single narrow slit with width w. Explainwhere the dark spots would located. (You should find the equationfor this.) Use diagram(s) and words to explain why.

c) Explain what Babinet's principle is. Explain how you canmeasure the thickness of a hair using the principle ofdiffraction.

Answer & Explanation Solved by verified expert
3.8 Ratings (596 Votes)
Youcan measure the width of a single hair All you need is a darkroom a laser pointer some cardboard tape and a little bit ofmath And of course someones hair1 Make a frame that canhold your hair I cut a square of cardboard about 15 centimetersroughly six inches wide and then cut a small rectangle insideit My inside cutout was about one centimeter 039 inches wideand four centimeters 15 inches tall2 Take a human hair maybefrom your own head or from a willing    See Answer
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