μ-λ
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Procedure
- Hover your cursor over the slider handle (1 or 3) and use the up and down arrow keys on the keyboard for fine-tuning. The textbox 2 and 4 can be used for fine adjustment of the telescope and prism table respectively.
- First Place the prism in such a way that, the reflected beams by both the prism planes can be observed without rotating the prism.
- Record the position of the reflected beams in Table 1 as A1 and A2.
- Calculate the prism angle as described in Table 1.
- Repeat the same procedure 4 times and calculate the average value of the prism angle.
- Now rotate the prism table in such a way that, one of the spectra attains the position of minimum deviation (for example 5~35 degree of prism table).
- After fixing the position of the prism, record the position of the direct rays, reflected rays and the refracted rays in Table 2, using the telescope.
- Repeat the same for each spectra and tabulate in Table 2.
- Plot a
μ vs 1/λ2 graph from the experimental data and estimated the minimum deviation of the prism from that. - Wavelengths of the Mercury spectral lines are 420.6 nm, 447.2 nm, 492.2 nm, 501.6 nm, 587.6 nm, 667.8 nm
- In the case of direct reading, the telescope reading is 0.
