According to McBurney and Collings, the average threshold for human vision is a candle flame seen from ________ mile(s) on a dark, clear night.
A) 30
B) 1
C) 15
D) 7.5

Question

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The Answer of According to McBurney and Collings, the average threshold for human vision is a candle flame seen from ________ mile(s) on a dark, clear night.
A) 30
B) 1
C) 15
D) 7.5

According to McBurney and Collings, the Average Threshold for Human