3. Table of Contents Chapter 16: Fundamentals of Light Section 16.1: Illumination Section 16.2: The Wave Nature of Light Chapter 16
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27. Illumination Illumination of a Surface What is the illumination on your desktop if it is lighted by a 1750-lm lamp that is 2.50 m above your desk? Section 16.1
28. Illumination Step 1: Analyze and Sketch the Problem Section 16.1 Illumination of a Surface
29. Illumination Assume that the lightbulb is a point source. Section 16.1 Illumination of a Surface
30. Illumination Diagram the position of the bulb and desktop, and label P and r . Section 16.1 Illumination of a Surface
31. Illumination Identify the known and unknown variables. Section 16.1 Known: P = 1.75 ×10 3 lm r = 2.50 m Unknown: E = ? Illumination of a Surface
32. Illumination Step 2: Solve for the Unknown Section 16.1 Illumination of a Surface
33. Illumination The surface is perpendicular to the direction in which the light ray is traveling, so you can use the point source illuminance equation. Section 16.1 Illumination of a Surface
34. Illumination Substitute P = 1.75×10 3 lm, r = 2.50 m Section 16.1 = 22.3 lm/m 2 = 22.3 lx Illumination of a Surface
99. Illumination Illumination of a Surface What is the illumination on your desktop if it is lighted by a 1750-lm lamp that is 2.50 m above your desk? Section 16.1 Click the Back button to return to original slide.