Concept explainers
To Compare: The illumination on the book before and after the lamp is moved.
Answer to Problem 1PP
Illumination after moving the lamp is one ninth of the original illumination i.e.
Explanation of Solution
Given:
The lamp is moved from
Formula used:
The expression for illumination is given by
Here,
Calculation:
Luminous flux for different distances will remain the same.
Before light is moved, the illumination can be calculated by using equation (1)
Substitute
After light is moved, the illumination can be calculated by using equation (1)
Substitute
Divide both sides of equation (3) by equation (2),
Or
Conclusion:
Hence, illumination after moving the lamp is one ninth of the original illumination i.e.
Chapter 16 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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Sears And Zemansky's University Physics With Modern Physics
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College Physics: A Strategic Approach (3rd Edition)
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