![For which of the given is luminous efficiency maximum ?](https://www.gkseries.com/blog/wp-content/uploads/2022/05/For-which-of-the-given-is-luminous-efficiency-maximum-.png)
Q. For which of the given is luminous efficiency maximum ?
A. Sodium vapour lamp
B. Mercury vapour lamp
C. Arc lamp
D. Tungsten filament lamp
Answer: Sodium vapour lamp
A. Sodium vapour lamp
B. Mercury vapour lamp
C. Arc lamp
D. Tungsten filament lamp
Answer: Sodium vapour lamp
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