sapling learning You perform a double-slit experiment in order to measure the wa

Question

sapling learning You perform a double-slit experiment in order to measure the wavelength of the new laser that you received for your birthday. You set your slit spacing at 1.13 mm and place your screen 8.55 m from the slits. Then you illuminate the slits with your new toy and find on the screen that the tenth bright fri is 4.71 cm away from the central bright fringe (counted as the zeroth bright fringe). What is your laser s wavelength expressed in nanometers? Number nm A Previous g Give Up & View Solution Check Answer Next Exit Hint

Explanation / Answer

in double slit experiment path differene = d*y/R

for constructive interfernce path differene = m*lambda

m = order of the fringe

d = slit width

R = distance of the screen from the slit

y = distance of the 10 th bright fringe from the center

d*y/R = m*lambda

lambda = d*y/m*R

lambda = (1.13*10^-3*4.71*10^-2)/(10*8.55) = 622.5 nm <-------answer

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