Question: Find the minimum deviation angle for the bright yellow spectral line. Start by locating the line. Then, rotate the prism so you see the line

Find the minimum deviation angle for the bright yellow spectral line. Start by locating the line. Then, rotate the prism so you see the line move to the right, reverse direction, and then move to the left. The minimum deviation angle corresponds to the turning point. Leave your prism in this position for all helium line measurements. We can approximate min for the remaining wavelengths. Then, the IOR can be calculated using

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