1. Find the intensity of a light source that produces an illumination of 5.50 ft-candles at 9.85 ft from the source.

2. Find the intensity of a light source that produces an illumination of 2.39 lux at 4.50 m from the source.

3. Find the intensity of a light source that produces an illumination of 5.28 lux at 6.50 m from the source.

4. If an observer triples her distance from a light source:

(a) Does the illumination at that point increase or decrease?

(b) In what proportion does the illumination increase or decrease?

5. If the illuminated surface is slanted at an angle of 35.0°, what part of the full-front illumination is lost?