2m grating purple bright fringes screen · 1=?·

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Coherent red light (fr = 4.00 ×1014 Hz) and blue light (fb = 6.00 ×1014 Hz ) is shone through a diffraction grating onto a screen located from the grating. The central bright spot looks purple, and there are two other purple bright spots that appear – one at each edge of the screen.

(a) Find the total number of red and blue (not purple) bright fringes that appear on the screen.
(b) If the spacing of the slits in the diffraction grating is 3 ×10−6 m, find the width of the screen.

2m
grating
purple
bright
fringes
screen
· 1=?·
Transcribed Image Text:2m grating purple bright fringes screen · 1=?·
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