Total internal reflection

What is refraction

Light refracts when it crosses a boundary between 2 different medias. Light travels slower in denser materials like watee or glass compared to air

Less than critical angle

Refraction

Equal to critical angle

Boundary

More than critical angle

Total interal reflection

When does total interal refraction only occur

→ When light moves from a denser material to a less dense material

→ Angle of incifpdence is greater than the critical angle

What does opticsl fibres use

TIR

What are optical fibres used for

Endoscopes and commumication

Why are optical fibres good

No ionising radiation

Why is infra red good for communication

Can travel further in the cable

What type of waves are electromagnetic waves

Transverse waves

What can be used instead of satellites

Optical fibres

What is the good and bad about microwaves when against infra red

They travel faster but the distance is longer so there might be a delay