Q: What will be the number of lamps, each having 200 lumens, required to obtain an average illuminance of 50 lux, on a 4m × 3m rectangular room? 4m × 3m के आयताकार कमरे में 50 लक्स की औसत प्रदीप्ति प्राप्त करने के लिए, 200 ल्यूमेन वाले प्रत्येक आवश्यक लैंपों की संख्या कितनी होगी?
A.
2
B.
4
C.
6
D.
3
Correct Answer:
Option D -
Explanations:
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