The critical angle and optical fibres

Question	Answer
What is the law of reflection?	The angle of incidence equals the angle of reflection
How do we describe the image in a plane mirror?	Virtual and upright
When does total internal reflection occur?	When the angle of incidence is beyond the critical angle
How do we calculate the critical angle?	Sin c = 1 / n
Where do we use total internal reflection?	Send pulses of light along optical fibres
Which of these is untrue about ray diagrams?	In ray diagrams, more arrow heads meaning a brighter light is false
What is the term that describes the change in direction of light when it changes medium?	Refraction
Which of these is an advantage of using optical fibres?	Light travels very quickly along optical fibres
Where are optical fibres often used?	By doctors in hospitals
Which statement explains why refraction occurs?	Light rays always travel in a straight line

Resource summary

	Created by lily bevan over 7 years ago