Light

The video tutorial explains the concept of light sources, highlighting various examples such as bulbs, candles, and the sun. It emphasizes the importance of light for vision and discusses different light sources used at night, like torches and lamps. The sun is identified as the largest and most significant light source, providing essential illumination during the day.

What is a light source?

What happens when there is no light source?

Why do we use light sources at night?

What is the biggest light source mentioned in the text?

How does the sun affect our ability to see?