Optics Question 489
Question: Five lumen/watt is the luminous efficiency of a lamp and its luminous intensity is 35 candela. The power of the lamp is
[CPMT 1992]
Options:
A) 80 W
B) 176 W
C) 88 W
D) 36 W
Show Answer
Answer:
Correct Answer: C
Solution:
Efficiency of light source
and
From equation (i) and (ii)
