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

Which of the following options define the cosine law of illuminance?

1
E = (I/d2) cosθ 
2
E = (I/d) cosθ 
3
E = (I/I2) cosθ 
4
 E = I cosθ 
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