A helium-neon laser (?=633nm) illuminates a diffraction grating. The distance between the two m=1bright fringes is 38 cm on a screen 1.6 m behind the grating.
a. What is the spacing between slits of the grating?
Express your answer to two significant figures and include the appropriate units.
d = ???
NOTE: 4.3*10-6m is wrong.
here,
lamda = 633 * 10^-9 m
screen distance , D = 1.6 m
let the slit spacing be d
y = m * lamda * D/d
0.38 = 1 * 633 * 10^-9 * 1.6 /d
solving for d
d = 2.67 * 10^-6 m
the slit spacing is 2.67 * 10^-6 m
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