Given the following scene on the stage Spotlight #1 1 meter diameter Spotlight #2 2 meters diameter Both spotlights SPOTLIGHT#1 and SPOTLIGHT#2 are place at 20 meters from the stage. You want to produce a circle of light of 1meter diameter with the SPOTLIGHT#1and a circle of light of 2 meters diameter with the SPOTLIGHT#2
Given the following scene on the stage Spotlight #1 1 meter diameter Spotlight #2 2 meters diameter Both spotlights SPOTLIGHT#1 and SPOTLIGHT#2 are place at 20 meters from the stage. You want to produce a circle of light of 1meter diameter with the SPOTLIGHT#1and a circle of light of 2 meters diameter with the SPOTLIGHT#2
Glencoe Physics: Principles and Problems, Student Edition
1st Edition
ISBN:9780078807213
Author:Paul W. Zitzewitz
Publisher:Paul W. Zitzewitz
Chapter18: Refraction And Lenses
Section: Chapter Questions
Problem 41A
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If the lamp used is a LED lamp with an efficacy of 90 Lumen/Watt, what will be the power of the lamp?
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