Reflection Flashcards
What are the 2 conditions of TIR
The ray must be travelling form a more to less dense medium
Angle of incidence must be larger than the critical angle for material
Is the light a longitudinal or transverse wave?
Transverse
Is glass or air more dense
Glass because it’s a solid
What does refraction mean
The change in direction of a wave from one medium to another caused by the change in speed
What is reflection
The bouncing back of a wave at a boundary. Angle of incidence is equal to angle of reflection
Why and how does a light ray refract when it enters a glass block
Glass is more dense so it slows down
Wavelength decreases and bends towards normal
What are the advantages of using optical fibres instead of wires to transmit signals
Signals not affected by weather
Less likely to be interfered with
Give two uses for optical fibres
Communication
Endoscope
What is a CT scan
3D image built of multiple x rays
What is an endoscope
Uses optical fibres as a camera for surgery live image
Give two advantages of a CT scan over a endoscope( using an endoscope)
Ct scan give detailed insight into the body overall internal structure and large.
And it’s non invasive
Give an advantage of an endoscope over a CT scan
Doesn’t use ionising radiation and there’s no cancer risk
Six marker
C= the angel of incidence is greater than the critical angle.so it would be total internal reflection
B=the angle of incidence is same as the critical angle it would travel along the boundary(90)
A=the angle of incidence is less than the critical angle this is refraction
What is optical fibre
Optical fibre are thin rods of glass that carry information as pulses of light. They rely on total internal reflection to operate
What is endoscopy
It is a medical procedure that uses a endoscope to look inside the body
