9. How would you express illumination? A. E = I/r B. E = I2/r C. E = I/r2 D. E = I2/r2
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9. How would you express illumination? A. E = I/r B. E = I2/r C. E = I/r2 D. E = I2/r2
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Answer:
E = I/r²
Explanation:
Where:
E - illuminance in lumen (lm)
I - intensity in lumen per square of distance (lm/m² or lux)
r - distance of source in meters (m)