Vrae
/ Questions:
1. Wat is ‘n grenshoek? / What is a critical angle? (1
punt/mark)
2. Wat is totale interne weerkaatsing (TIW)? / What is total internal reflection (TIR)?
(1 punt/mark)
(1 punt/mark)
3. Noem die twee voorwaardes vir TIW om plaas te
vind. / Name the two conditions for TIR
to take place. (2 punte/marks)
4. Optiese vesels maak gebruik van totale
interne weerkaatsing. Noem twee
toepassings van optiese vesels: / Optical
fibres make use of total internal reflection.
Name two uses of optical fibres.
(2 punte/marks)
(2 punte/marks)
5. Hierdie toepassing van optiese vesels het
sekere voordele bo koperdraad. Noem
minstens ses van hierde voordele. / The
use of optical fibres has certain advantages over coper wires. Name at least six of these advantages. (6
punte/marks)
6. Wat is Snell se Wet? Skryf die formule neer. / What is Snell’s Law? Write down the formula.
(1 punt/mark)
(1 punt/mark)
7. Wat is die grootte van die grenshoek in jou
ligdiagram sodat daar totale interne
weerkaatsing plaasvind? / What is the
size of the critical angle in order for total internal reflection to take
place?
(1 punt/mark)
(1 punt/mark)
8. Voltooi die
volgende ligdiagramme, om die weg wat die lig beweeg in elke geval aan te dui.
/ Complete the following ray diagrams, to
show the path of the light in each situation.
9. A light ray
with an angle of incidence of 35°
passes from water to air. Find the angle
of refraction using Snell’s Law. Discuss
the meaning of your answer.
10. A light ray
passes from water to diamond with an angle of incidence of 75°. Calculate the angle of refraction using
Snell’s Law. Discuss the meaning of your
answer.
Total [20]
