Question

Diffraction gratings using a spectrometer: a) Calculate values of the grating constant d, using d =...

Diffraction gratings using a spectrometer:

a) Calculate values of the grating constant d, using d = mλ /sinθ.

b) Using the average value of d, calculate D.

My table of results from the lab is below. The central position was 0.5°. The angles used in equations must be the working angles.

Measured Left Angle

Measured Right Angle

Wavelength

Violet

5.1°

354.9°

447.2 nanometres

Blue

5.5°

354.6°

471.1 nanometres

Green 2

5.8°

354.3°

492.2 nanometres

Green 1

5.9°

354.0°

501.6 nanometres

Yellow

6.8°

353.2°

587.6 nanometres

Red 2

8.8°

352.3°

667.8 nanometres

Red 1

8.10°

351.8°

706.5 nanometres
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Answer #1

Here I have separately calculate d value for each color, then calculate average of gratings.

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