Alysha A.

asked • 11/10/20

Calculating total fringes on a plate

Light that has a wave length of 686 nm is used to illuminate two glass plates at normal incidence. The plates are 26.7cm in length touching at one end are separated at the other end by a wire that has a radius of 0.064 mm. How many bright fringes appear along the total length of the plate?

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Dr Gulshan S. answered • 11/10/20

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Alysha A.

There’s nothing written here. Am I supposed to contact you?
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11/10/20

Dr Gulshan S.

Yes Ayesha I actually recorded a video but that has some how disappeared
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11/10/20

Alysha A.

what do i do with the number i got for beta?
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11/10/20

Dr Gulshan S.

Beta is width of one fringe in m . From here find the total number of dark fringes in given length of lower glass plate( change from cm to m first) The number of bright fringes will be one less than this number as first fringe is dark at the edge of wedge.
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11/10/20

Dr Gulshan S.

in Case of any doubt you may write again on Wyzant portal
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11/10/20

Dr Gulshan S.

Hope you got the correct answer
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11/11/20

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