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.

What phenomenon causes us to see the sun before it actually rises?

• Reflection

• Diffraction

• Refraction

• Dispersion

What is the term for the line where the sky meets the Earth?

• Meridian

• Horizon

• Equator

• Zenith

In the experiment, what is the role of the 'normal' line?

• It is the line parallel to the surface

• It is the line perpendicular to the surface at the point of incidence

• It is the line that measures the speed of light

• It is the path of the light ray

What happens to the angle of refraction when light passes from glass to water?

• It becomes zero

• It increases

• It remains the same

• It decreases

What is the constant value obtained from the ratio of sine of angle of incidence to sine of angle of refraction?

• Refractive index

• Speed of light

• Critical angle

• Total internal reflection

Who discovered Snell's Law?

• Isaac Newton

• Galileo Galilei

• Albert Einstein

• Willebrord Snellius

What occurs when the angle of incidence is greater than the critical angle?

• Total internal reflection

• Reflection

• Diffraction

• Refraction