If luminous efficiency of a lamp is 2 lumen/watt and its luminous inte – McqOptions

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1.	If luminous efficiency of a lamp is 2 lumen/watt and its luminous intensity is 42 candela, then power of the lamp is [AFMC 1998]
A.	62 W
B.	76 W
C.	138 W
D.	264 W
Answer» E.

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