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The distance between the centers of adjacent openings in a diffraction grating is 0.0100 mm. A viewing screen is 1.00 m from the grating. The bright fringes near the center of the screen are spaced apart by 4.50 cm. What is the wavelength of the light?
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λ = x . d / L = 4.5 . 10^–2 . 10^–5 / 1.0 = 4.5 . 10^–7 m = 450 nm