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Question: In the grating equation nλ=d sin θ, the quantity θ will be determined in the lab using the angular scale on the experimental apparatus. using meter sticks and geometry/trigonometry. using a protractor |
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Solution: Angular scale present on the experimental is used to determine the angle θ. When you look through the eye-piece, the angle of the eye-piece is the required angle. The apparatus has graduations below the eye-piece which can be used to measure the angle.
If you are not using the apparatus to view interference pattern, you can simply use meter sticks to measure the distances and calculate θ using geometry/trigonometry. |
