railway RRB JE (CBT I + CBT II) Mock Test 2024 Utilization of Electrical Energy Illumination

Find the illumination on the normal surface if the candle power of a lamp is 150 and a place surface is placed at a distance of 1.5 meters from this lamp.

1
66.66 lux  
2
66.7 lux
3
66.8 lux 
4
66.9 lux
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