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Physics - Light and Optics (Form II)

English physics form2 light optics reflection refraction lenses
Muhtasari / Summary: Light: reflection, refraction, Snell's Law, and lenses.
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Light travels in straight lines at 3×10⁸ m/s in a vacuum. Reflection: angle of incidence = angle of reflection (measured from normal). Refraction occurs when light passes between media of different densities – Snell's Law: n₁sinθ₁ = n₂sinθ₂. Refractive index n = sin i / sin r. Lenses: Convex (converging) – used in cameras and magnifying glasses. Concave (diverging) – used to correct short-sight.

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