Reduction factor of a source of light

Q.  Reduction factor of a source of light is the ratio of its
- Published on 04 Sep 15

a. Mean horizontal candle power to the mean spherical candle power
b. Mean spherical candle power to the mean horizontal candle power
c. Maximum horizontal candle power to the mean spherical candle power
d. Mean spherical horizontal candle power to the maximum spherical candle power

ANSWER: Mean spherical candle power to the mean horizontal candle power

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