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47. a) Imagine that you are conducting an activity with a laser to create an interference  pattern....

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Physics

47. a) Imagine that you are conducting an activitywith a laser to create an interference 


pattern. Use the appropriate equations to predict twoways (other than the way 


described in the following example) to change theinterference pattern in order to 


have closer fringes. Explain your predictions.


Here’s an example to get you started:


According to the equation


Δx = Lλ/d , 


the distance between the fringes (∆x) is proportionalto the wavelength (since 


they are both numerators). This means that increasingone will increase the other. 


Therefore, decreasing the wavelength will decrease thedistance between the fringes. 


(Hint: You can use the “Thomas Young’s Double-slitExperiment” simulation from 


this lesson to verify yourpredictions.) 


b) If you were using a hands-on activity to verifyyour predictions and use 


measurements to determine the wavelength of the laserbeing used, describe any 


safety precautions you would take and sources of errorthat you might encounter. Be 


sure to explain how you might reduce the effects ofthe sources of error.


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