The diffraction grating analysis in this chapter assumed that the incident light

Question

The diffraction grating analysis in this chapter assumed that the incident light is normal to the grating The figure shows a plane wave approaching a diffraction grating at angle theta. show that the angles theta m tor constructive interference are given by the grating equation where m = 0, plusminus 1, plusminus 2,... Angles are considered positive if they are above the horizontal line, negative if below it. The two first-order maxima m = +1 and m = -1, are no longer symmetrical about the center Find theta 1, and theta_1 for 540 nm light incident on a 630 line/mm grating at theta = 26 degree.

Explanation / Answer

d = (630 line/mm)-1 = 26o. = 540 nm d(sinm + sin) = m m = sin-1(m/d -sin) 1 = sin-1(/d - sin) =-5.6o -1 = sin-1(-/d - sin) =-51.1o

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