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Niles
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Hi
In the Diffraction Handbook http://gratings.newport.com/library/handbook/chapter6.asp#6.2.4 it says:
A grating used in the Littrow or autocollimating configuration diffracts light of wavelength λ back along the incident light direction (Figure 6-4). In a Littrow monochromator, the spectrum is scanned by rotating the grating; this reorients the grating normal, so the angles of incidence a and diffraction b change (even though a = b for all λ).
I don't understand what they mean by "even though a = b for all λ". Does anybody know, who wants to clarify this for me?
Niles.
In the Diffraction Handbook http://gratings.newport.com/library/handbook/chapter6.asp#6.2.4 it says:
A grating used in the Littrow or autocollimating configuration diffracts light of wavelength λ back along the incident light direction (Figure 6-4). In a Littrow monochromator, the spectrum is scanned by rotating the grating; this reorients the grating normal, so the angles of incidence a and diffraction b change (even though a = b for all λ).
I don't understand what they mean by "even though a = b for all λ". Does anybody know, who wants to clarify this for me?
Niles.