Question

The old unit of intensity of light is:

• A. inch candle
• B. yard candle
• C. foot candle
• D. none of the above

Answer 1

The correct option is C

foot candle

Explanation for correct option:

1. A foot-candle is an old unit of measurement of light intensity.
2. One foot-candle is defined as enough light to saturate a one-foot square with one lumen of light.

Hence, the correct answer is option (C).