In the grating equation nλ=d sin θ, the quantity θ will be determined in the lab

In the grating equation nλ=d sin θ, the quantity θ will be determined in the lab

Question: In the grating equation nλ=d sin θ, the quantity θ will be determined in the lab: Using meter sticks and geometry/trigonometry, using the angular scale on the experimental apparatus, using a protractor.

Answer: Using meter sticks and geometry/trigonometry