The luminous efficiency of a lamp is 5 lumen/watt and its power is 88 watt. What is the illuminance on a surface placed at a distance of 10 𝑚 , when the light is falling normally?
A. 0.35 lux
B. 0.6 lux
C. 0.5 lux
D. 0.45 lux
Answer:A
The luminous efficiency of a lamp is 5 lumen/watt and its power is 88 watt. What is the illuminance on a surface placed at a distance of 10 𝑚 , when the light is falling normally?
A. 0.35 lux B. 0.6 lux C. 0.5 lux D. 0.45 lux