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diffraction pattern question help
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terr123_78787
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laser light of wavelength 640nm is incident normally at a diffraction grating. the separation between adjacent slits (lines) is 3.3 x 10^-6 m.
what is the total number of bright spots that can be observed in the diffraction pattern?
what is the total number of bright spots that can be observed in the diffraction pattern?
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ak1237
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Using the diffraction grating equation d sin(θ) = n λ, you can rearrange to get n = (d sin(θ))/λ. As the angle increases, more and more bright spots are visible. This occurs up until θ = 90 degrees at which point the light would be perpendicular to the incident light. Therefore, no light is visible at θ > 90 degrees. So setting θ = 90 in the equation (so sin(θ) = 1) gets n = 5.15625. This means that 5 total spots are visible (as the 6th spot is going to be after 90 degrees).
Hope this helps
Hope this helps
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terr123_78787
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(Original post by ak1237)
Using the diffraction grating equation d sin(θ) = n λ, you can rearrange to get n = (d sin(θ))/λ. As the angle increases, more and more bright spots are visible. This occurs up until θ = 90 degrees at which point the light would be perpendicular to the incident light. Therefore, no light is visible at θ > 90 degrees. So setting θ = 90 in the equation (so sin(θ) = 1) gets n = 5.15625. This means that 5 total spots are visible (as the 6th spot is going to be after 90 degrees).
Hope this helps
Using the diffraction grating equation d sin(θ) = n λ, you can rearrange to get n = (d sin(θ))/λ. As the angle increases, more and more bright spots are visible. This occurs up until θ = 90 degrees at which point the light would be perpendicular to the incident light. Therefore, no light is visible at θ > 90 degrees. So setting θ = 90 in the equation (so sin(θ) = 1) gets n = 5.15625. This means that 5 total spots are visible (as the 6th spot is going to be after 90 degrees).
Hope this helps
you really help
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Mrs boss
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therevenger778
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(Original post by therevenger778)
why
why
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