Question

Choose the green light first. λ = 5.461 x 10^-7 meters for green

Choose lens to “Grating distance” as 7 and

“Grading lines per nm” as 400 nm

Check the button “Grading in place”

Record I₁ and I₁’ to the table and calculate an angle as average if you know both I₁ and I₁’

(hint from your trig how to get your angle: tan^-1 (Opposite / Adjacent) = θ(angle)

Find distance between I’₁ and I₁ and divide in half to get I1'. I1 being the first green dot to the left of the zero point, I1' being the first green dot to the right of the zero point.

Diffraction Grating Laser Lab ✓ Grating in Place Lens to Grating Distance (3-10m) 7 Grating lines per mm (200-500) 400 Wavelength (400-700 nm) 546.1 ITTTTTTTTTTTTTTTTTTTTTTTTT TETTTTT Diffraction grating Laser

Color	Distance          to I1	Distance          to I1'	Angle average          (θ)	Grating         Constant d
Green	1.575m	1.575m	45degrees

Calculate constant grating distance (show!!!) d from grading lines per nm _________ __________________________________

Calculated value for wavelength λ (Recall: nλ = d sin θ, n=1) _________________________

Calculate your percent error between your calculated value and known value

λ = 5.461 x 10^-7 meters for green

Δ% = _ ________________________

Show all calculations in detail.

Answer 1