Assuming that the grating density is 1,000 lines/mm, λ = 560 nm, and incident angle θa = 30°, the second order of the images will occur at 38.32°.
Calculate grating spacing:
d = 10-3 m/1 × 10-3 = 10-6 m.
Use the formula: a × λ = d × sinθa.
Insert data:
2 × 560 × 10-9 m = 10-6 m × sin(30°) = 38.32°.
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