Refraction of Light and Apparent Sunrise and Delayed Sunset Explained

The video explains the phenomena of apparent sunrise and delayed sunset, which occur due to the refraction of light in Earth's atmosphere. It introduces an experiment using a laser and different mediums to demonstrate refraction. The video discusses how light bends when passing through mediums of varying densities, affecting the speed of light. Snell's Law is introduced, explaining the relationship between angles of incidence and refraction. The concept of total internal reflection is also covered, highlighting its occurrence when the angle of incidence exceeds the critical angle.

How does the speed of light change when it moves through different mediums?

What is total internal reflection and under what conditions does it occur?

What is the critical angle in the context of refraction?