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Q:

ल्यूमेन (Lumen) किसका मात्रक है ?

  • 1
    ज्योति तीव्रता का
  • 2
    ज्योति फ्लक्स का
  • 3
    A और B दोनों
  • 4
    इनमें से कोई नहीं
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Answer : 2. "ज्योति फ्लक्स का"
Explanation :

The SI unit of luminous flux is the lumen (lm). One lumen is defined as the luminous flux of light produced by a light source that emits 1 cd of luminous intensity over a solid angle of 1 sr. In other systems of units, luminous flux may have units of power.

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