B.) Suppose the single-slit is replaced by two slits, where each slit has the sa
ID: 1497075 • Letter: B
Question
B.) Suppose the single-slit is replaced by two slits, where each slit has the same opening width as that found above. These two slits are separated by 2.29 x 10-3 m.
How many bright interference fringes appear in delta x (the distance given above in previous part)? Hint: You do not need to use your answer to question #1 in this solution.
Laser light of wavelength 583 nm is incident upon a single slit. 10-3 m. The figure shows the pattern observed on a screen located 3.0 m from the slit. Note the distance delta x is 8.48xExplanation / Answer
A) For single slit experiment,
d sin theta = n Lambda
d *8.48*10^-3 / 3 = 1*583*10^-9
d = 583*10^-9 *3/8.48*10^-3
=0.00020625 m
width d = 2.06 *10^-4 m
B) y = m lambda D/d
m = yd/[D lambda]
= (8.48*10^-3 /2)*2.29 x 10^-3 /[3*583*10^-9] = 5.5
so m = 5
total number of bright fringes are 5 on either side of central maxima + 1 in center
total number of bright fringes =5+5+1 = 11
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