Monochromatic light falls on a screen 1.60 m from two slits separated by 2.11 mm. The first- and second-order bright fringes are separated b

Question

Monochromatic light falls on a screen 1.60 m from two slits separated by 2.11 mm. The first- and second-order bright fringes are separated by 0.550 mm. What is the wavelength of the light?

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Lệ Thu 3 years 2021-08-06T00:07:39+00:00 1 Answers 12 views 0

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  1. Sigrid
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    2021-08-06T00:09:08+00:00
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    Answer:

    725 x10^-9m

    Explanation:

    We know that the optical path difference is (ax)/D

    Where

    a=2.11mm

    D=1.60m

    x= position on the screen

    the optical path differences varies of lambda = wavelength

    That is BTW two bright fringes

    So therefore

    x2-x1=lambda x D/a

    lambda = ( x2 – x1) x a/D = 0.55 x 10^-3 x 2.11E-3 / 1.60 = 725nm

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