2.8 Refraction

What is refraction?

• Refraction is the bending of light when it enters a different medium.
• Refraction is the absorption of light in a medium.
• Refraction is the reflection of light off a surface.
• Refraction is the scattering of light in the atmosphere.

Why does refraction occur?

• Refraction occurs due to the change in speed of light as it passes between different media.
• Refraction happens when light is reflected off a surface.
• Refraction is caused by the bending of sound waves.
• Refraction occurs because light is absorbed by the medium.

In which medium does light travel the fastest?

• In vegetable oil

• In glass
• In water
• In air

What is the speed of light in air?

• Approximately 50,000 kilometers per second

• Approximately 150,000 kilometers per second
• Approximately 100,000 kilometers per second

• Approximately 300,000 kilometers per second

Which angle from the diagram is the angle of refraction?

• i

• r

• R

• 90°

When light travels from air into glass,

• All of it is reflected.

• All of it is refracted.

• Some of it is reflected and some is refracted.

• All of it is absorbed.

When light travels from a medium into a denser medium,

• The light bends away from the normal.
• The light speeds up as it enters the denser medium.
• The light continues in a straight line.
• The light bends towards the normal.

When light travels from a medium into a less dense medium,

• The light will bend away from the normal.
• The light will not change direction.
• The light will bend towards the normal.
• The light will reflect back into the medium.

When will the angle of incidence equal the angle of refraction when light travels from 1 medium into another different medium?

• When light travels from a vacuum to a denser medium.
• When light travels through a prism at any angle.
• When the angle of incidence is 0° (perpendicular to interface).

• When light travels from a medium with higher refractive index to a lower one.