What is the wavelength of the light?
Two slits are measured to be 0.027 mm apart. When monochromatic light falls on the slits, the 4th order bright fringe falls at a 9.7 degree angle. What is the wavelength of the light?
0.980
1.13
1.14
0.860
Two slits are measured to be 0.027 mm apart. When monochromatic light falls on the slits, the 4th order bright fringe falls at a 9.7 degree angle. What is the wavelength of the light?
0.980
1.13
1.14
0.860
?
Favorite Answer
d sinθ = mλ (for bright maxima)
=>
λ = (d sinθ)/m
λ = [(2.7×10⁻⁵m)sin9.7°]/4
λ = 1.14×10⁻⁶ m (114 nm)