engineering recuitment PGCIL Trainee Supervisor Electrical Mock Test 2024 Utilization of Electrical Energy Illumination
A surface inclined at an angle of 60∘ to the rays is kept 5 m away from a 250 candle power lamp. Find the average intensity of illumination on the surface.
1
10 lux
2
20 lux
3
30 lux
4
40 lux