Concept explainers
To calculate: The radius of the lens for an exposure time of 0.0025 s , if the lens of radius 1 cm is taking 0.01 s of exposure time , also given the exposure time needed for a photograph is inversely proportional to the square of the radius of the camera lens.
Answer to Problem 8P
The radius of the lens is
Explanation of Solution
Given information:
The exposure time needed for a photograph is inversely proportional to the square of the radius of the camera lens.
Let, r is the radius of the lens
t is the exposure time
So
Let k be a constant
Put the value of t and r in equation 1 to get the value of k .
Solve further to get k ,
Now, put the value of t and k in equation 1 to get r ..
After solving,
Chapter 12 Solutions
Algebra: Structure And Method, Book 1
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