A 650 nm laser illuminates a 100 lines/mm diffraction grating, producing a diffraction pattern on a...

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A 650 nm laser illuminates a 100 lines/mm diffraction grating, producing a diffraction pattern on a screen (see figure). How far is the diffraction grating from the screen?

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Answer 1

Answer #1

given

lamda = 650 nm = 650*10^-9 m
distance between central nright fringe to 1st bright fringe, y1_max = 7 cm

= 0.07 m

line spacing on the grating, d = 1 mm/100

= 10^-2 mm

= 10^-5 m

let R is the distance from grating to screen.

we know, y1_max = lamda*R/d

==> R = y1_max*d/lamda

= 0.07*10^-5/(650*10^-9)

= 1.08 m <<<<<<<<<<<<-----------------Answer

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Answer 2

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