Adjust the eyepiece until the cross threads are clearly in focus.The grating surface is never touched while handling it.Make sure diffraction grating is standing vertically.The prism table should be properly leveled.Here, λ = wavelength, θ = degrees and n = order image. (8) Calculate the average value of the wavelength using the formula: λ = dsinθ/n (7) Repeat steps 5 and 6 for the corresponding 1st order image on the right. (6) Measure and record the readings on the circular scale/vernier scale. (5) Move the telescope to the left and right to find the 1st order image. (4) Look through the eye-piece which is straight in front of the grating to find the zero-order images. (3) Place the diffraction grating vertically in the holder.
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