Critical Angle of Incidence - Edubirdie

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

2024
Views:

119

Pages:

5
Author:

Jabin F.

Critical angle of incidence (θc): If a wave travels from a denser to a rarer medium (n1 > n2), and the angle of incidence (θi) is less than the critical angle (θc): The angle of refraction (θt) is 90 degrees. θi = θc Snell's Law: sin(θi) / sin(θt) = n2 / n1 Derivation of the critical angle formula: sin(θc) / sin(90°) = n2 / n1 sin(θc) = n2 / n1 θc = sin^(-1)(n2 / n1) Total internal reflection: If θi > θc, then total internal reflection takes place. Transmission coefficient (T) = 0 Reflection coefficient (R) = 1 Independent of the type of polarization Denser to Rare: (Eor / Eoi) * (1) = +ve → no phase change Then magnetic field will change the phase by π (of photon-d) Ques. 39: Denser (m1) → Rarer (m2) θc = sin^(-1)(m2 / m1) = sin^(-1)(1/5) θc = 41.8° Ques. 40: Ei = (8i + 6j + 5k) * e^(j(ωt + 3x - 4y)) Ki = -(3i - 4j) Kii = (3i + 4j) Kmi = 3 Ksi = (3c + 4x) R = (3i + 4j) * e^(j(ωt + 3x - 4y)) → e^(j(ωt + 3x - 4y)) = 0 → (R - 3i - 4j) * e^(j(ωt + 3x - 4y)) = 0

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