Absent Spectra | Lecture Note - Edubirdie

University:
Santa Fe College
Course:
ETS 2527C | Electromechanical Components and Mechanisms
Academic year:

2024
Views:

410

Pages:

6
Author:

Jabin F.

Key Points: Intensity of diffraction from a diffraction grating: I = A² * (sinα/α)² * (sin(Nβ) / sinβ)² The first term (sinα/α)² is due to single-slit diffraction. The second term (sin(Nβ) / sinβ)² is due to the combined effect of all slits. Screen would be dark only if S₁ in direction θ contains diffraction minima. Diffraction minima: asinθ = mλ, where m = ±1, ±2, ±3, ... Visual Elements: A diagram of a diffraction grating with labeled parameters. A formula for the intensity of diffraction from a grating. An explanation of the conditions for dark spots on the screen. A diagram of a single slit diffraction pattern. ontinuation from previous image: (ab)^2 / 4 = d^2 + b^2 / 4 (ab)^2 = 4d^2 + b^2 d^2 = (4(ab)^2 - b^2) / 4 d = (b/2) * √((4a/b)^2 - 1) Option-b Diagram: Incident wave Diffracted wave Screen θ a b d Formulas: a * sinθ = mλ (a + b) * sinθ = mλ tanθ = y / z Calculations: tanθ = 1/2 θ = 30° a + b = λ / sinθ = 600 / (1/2) = 1200 nm = 1.2 μm

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