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A lamp source of 3200 candela is mounted on a wall at a height of 2 meter from the work-plane. It subtends an angle of incidence of 60° with the center of the work plane. The illumination at the centre of the work plane in Lux is __________
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- 90 : 90
- 100 : 100
- 80 : 80
- 70 : 70
Correct Option: B
Eθ E cosθ
Eθ = 3200 cos 60θ = 1600
| Illumination = | = | = 100 | ||
| d² | 16 |
