A surface is illuminated normally by a 12 candela point source placed 3 m away. The illuminance on the surface is
Options
- A. 1 lux
- B. 4/3 lux
- C. 3 lux
- D. 4 lux
- E. 12 lux
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Correct Answer (Detailed Explanation is Below)
B. 4/3 lux
Detailed Explanation
For normal incidence, E = I/r² = 12/3² = 12/9 = 4/3 lux.
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