Question
Download Solution PDFA light source with a candle worth of power produces _______.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFLight Source and Candle Power:
A light source with a candle worth of power refers to a point source that emits light with an intensity of one candela (cd). The unit of luminous intensity is the candela, which is defined in terms of lumens per steradian.
Explanation of Options:
1. One lumen / radian: - This option is incorrect because lumens per radian is not a standard unit of measure for light.
2. One lumen / watt: - This option is incorrect because lumens per watt is a measure of luminous efficacy, not luminous intensity.
3. One lumen / steradian: - This option is correct. One candela is equal to one lumen per steradian. The steradian is the unit of measure for solid angles in three-dimensional space.
4. One lumen / meter: - This option is incorrect because lumens per meter is not a standard unit of measure for light.
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