Umbra and penumbra with two point light sources

Principle

When using two point light sources, umbra and penumbra are formed behind opaque bodies.

Benefits

• minimal preparation time
• light-intense halogen lamp
• easy teaching by using the demo board for demonstration
• ideal complement to analog student experiments by directly comparable devices

Tasks

Observe the shadow intensity behind the illuminated object and divide it into umbra and penumbra region.