The wings of some beetles have closely spaced parallel lines of melanin, causing the wing to act as a reflection grating. suppose sunlight shines straight onto a beetle wing.
if the melanin lines on the wing are spaced 2.0 apart, what is the first-order diffraction angle for green light (lamda=550 nm)?

15.96°

Explanation:

n = Diffraction order = 1

= Wavelength = 550 nm

d = Grating space = (generally given in )

= Diffraction angle

From diffraction theory we have the relation

The first-order diffraction angle for green light is 15.96°

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