Light (2)

Question 1

Inverse Square Law

Answer 1

Light gets less bright with distance.

• Doubling distance, quarters the intensity
• Surface Intensity = Intensity at source/Distance squared

Question 2

Lambert’s Cosine Law

Answer 2

Light intensity at a surface gets weaker if the surface is angled tot the light path.
- Intensity will diminish but contrast improves

Question 3

Light Intensity Management

Answer 3

Visible light measurements are made in units called “foot candles” or “lux”
- Most standards identify 1000lux = 100 foot candles (minimum)