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

Which of the following equations define the unit of luminous flux, lumens?

1

Lumens = Candle power + Solid angle

2

Lumens = Candle power x Solid angle

3

Lumens = Candle power/ Solid angle

4

Lumens = Candle power - Solid angle

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