Wave Nature of Light: Hygens' Principle
ICSE · Class 12 · Physics
All formulas from Wave Nature of Light: Hygens' Principle in ICSE Class 12 Physics. Key equations, constants, and identities for board exam preparation.
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Formulas
2. Wavefronts and Their Shapes
Wave speed = √(elasticity / density)
A ∝ 1/r and I ∝ 1/r^2
A = constant, I = constant
A ∝ 1/√r and I ∝ 1/r
4. Reflection by Huygens' Principle
sin i / sin r = BA' / AB' = vt / vt = 1 ⇒ i = r
Therefore, the incident ray, the reflected ray and the normal at the point of incidence are all in the same plane.
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