To Calculate: The distance above the surface where the lights should be placed.
Whether the desired illuminance be achieved if the lights are placed 1.5 m above the keyboard surface.
The change in lamp’s luminous flux required to achieve desired illuminance.
Explanation of Solution
Given:
Luminous flux of the lamp,
Desired illumination on the keyboard,
Formula used:
Here, Iis the luminous flux, E is the illumination and d is the distance from the source.
Calculation:
The distance from the keyboard where lights should be placed.
Illuminance if the lights are placed 1.5 m above the keyboard:
The illumination would exceed the desired illuminous.
The required luminous flux of the lamp to get desired illumination at 1.5 m away from the keyboard is:
Chapter 16 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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