A point source of luminous intensity 10 candela illuminates a surface normally at a distance of 2 m. The illuminance is
Options
- A. 1.5 lux
- B. 2.5 lux
- C. 5 lux
- D. 10 lux
- E. 20 lux
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Correct Answer (Detailed Explanation is Below)
C. 5 lux
Detailed Explanation
For normal incidence, illuminance E = I/r². Thus E = 10/2² = 10/4 = 2.5 lux. Therefore the correct option should be 2.5 lux.
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