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Unformatted text preview: XV.5 How much power is produced by a light source that emits 83 lumens/sr into all space? XV.6 A light bulb rated at 25 W has a luminous intensity of 151.2 lumens/sr. Determine the output of the bulb (in lumens). XV.7 A light bulb is suspended 4m above the floor. To what distance should it be lowered in order to increase the illuminance to 1.77 of its initial value? XV.8 If a book is held 3 m from a high-intensity lamp and then is moved to 60 cm from the lamp, by how much has the illuminance increased? XV.9 A 45 lumens/sr intensity lamp is located 1.2 m away from a screen on which it produces the same illuminance as another lamp 40 cm away. What is the intensity of the other lamp? XV.10 A 50 lumen/sr-M 2 source of radius equal to 10 cm, is 3 m away from an optical system that has an entrance pupil of 3 cm diameter. How many lumens are collected by the optical system?...
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This note was uploaded on 09/01/2010 for the course OPTICS 201 taught by Professor Dereniak during the Spring '05 term at UConn.
- Spring '05