The minimum luminous flux that the light must produce if the illuminance at the surface of each student’s desk is 160 lx.
Answer to Problem 6PP
Explanation of Solution
Given:
The distance is
Illuminance at the surface of each student’s desk is
Formula used:
The expression for illumination is given by
Here,
Calculation:
It is assumed that the light from the source strikes perpendicular to the surface of the disk.
From equation (1), after rearranging:
Substitute
Conclusion:
Hence, the required minimumluminous flux that light must produce is
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