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1. A laser beam with wavelength ? = 6328 A laser beam with wavelength ? = 6328 A

ID: 2260501 • Letter: 1

Question

1. A laser beam with wavelength ? = 6328

A laser beam with wavelength ? = 6328 A is incident normal to the plane of a diffraction grating. The grating has 550 lines per mm. If the diffraction pattern is viewed on a screen 10 cm from the grating, find the distance between the two first-order maxima in the pattern. A laser beam with wavelength ? = 6328 A is incident normal to a single slit of unknown width. The diffraction pattern as shown in the figure is formed on a screen 80 cm from the slit. Find the width of the slit.

Explanation / Answer

Y= mLR/d

Where m = 0rder= 1,2,,3,4,5

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1. A laser beam with wavelength ? = 6328 Å is incident normal to the plane of a

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