Refraction and Wave Behavior Concepts

The video tutorial explains the concept of refraction, where waves change direction when entering different media. It covers how light behaves when passing through materials like glass or water, affecting its velocity and wavelength. The tutorial also discusses optical illusions caused by refraction, such as the apparent bending of a straw in water.

What happens to a wave when it enters a different medium?

• Its frequency changes.

• It changes direction.

• It always speeds up.

• It becomes invisible.

Which property of a wave remains unchanged during refraction?

• Direction

• Velocity

• Wavelength

• Frequency

What occurs when a wave moves from a slow medium to a fast medium?

• The wave's velocity increases.

• The wave's velocity decreases.

• The wave's wavelength decreases.

• The wave's frequency changes.

How does light behave when it enters a denser medium?

• It bends towards the normal.

• It travels in a straight line.

• It speeds up.

• It bends away from the normal.

What is the effect of refraction on the angle of incidence and refraction?

• The angle of refraction is larger than the angle of incidence.

• The angle of refraction is smaller than the angle of incidence.

• Both angles remain the same.

• The angle of incidence is always zero.

What happens to light when it exits a slow medium into a faster one?

• It bends towards the normal.

• It bends away from the normal.

• It slows down.

• It becomes invisible.

How does the angle of light change when it enters a rectangular perspex block?

• It remains the same.

• It increases.

• It decreases.

• It becomes zero.

What is the role of the normal in refraction?

• It is the path light follows.

• It is the speed of light in a medium.

• It is a line at right angles to the surface.

• It is the angle of incidence.

Why do underwater objects appear displaced?

• Water distorts the object's shape.

• Light travels faster in water.

• The object's color changes.

• Light bends as it exits the water.

What causes the optical illusion of a bent straw in water?

• The straw is actually bent.

• Light refracts as it exits the water.

• The water magnifies the straw.

• The straw changes color.