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Ideal point light source - PowerPoint PPT Presentation

Chapter 26

Chapter 26. Reflection and Refraction. A Brief History of Light. 1000 AD It was proposed that light consisted of tiny particles Newton Used this particle model to explain reflection and refraction Huygens 1670 Explained many properties of light by proposing light was wave-like.

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Q. What solid angle is subtended at the center of 6 m diameter

W. R1. R2. Q. What solid angle is subtended at the center of 6 m diameter sphere by a 2 m 2 area on its surface?. W = A/R 2 = (2 m 2 )/(3 m) 2 = 0.22 sr. Luminous intensity: I = F/ W (luminous flux per unit solid angle) [lm/sr] = candela (cd). 3 m 2. 10 m.

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Ideal point light source - PowerPoint PPT Presentation

Chapter 26

Q. What solid angle is subtended at the center of 6 m diameter