4.9 Flashcards
1
Q
What is the critical angle?
A
The critical angle is the angle of incidence at which the refracted ray moves along the surface of the
medium (at 90 degrees to the normal).
2
Q
What is total internal reflection?
A
Beyond this angle, the light is reflected back into the medium.
3
Q
How are optical fibres used in our everyday lives?
A
Optical fibers use total internal reflection to carry signals for phone calls and internet.
4
Q
Where in our lives are microwaves used?
A
Microwaves are used in cooking, mobile phone communication, GPS and radar.
