1.6 - Total Internal Reflection

Question 1

Light travelling from a dense medium to a less dense medium

Answer 1

The speed of light increases and the light refracts away from the normal

Question 2

Angle of refraction

Answer 2

Greater than the angle of incidence

Question 3

Critical angle

Answer 3

Angle where light refracts 90 degrees and travels around the boundary

Question 4

Greater than the critical angle

Answer 4

Total internal reflection

Question 5

Conditions for total internal reflection

Answer 5

-Light must be travelling from a more to a less dense medium
-Angle of incidence must be greater than the critical angle

Question 6

How do optical fibres work?

Answer 6

Use of total internal reflection

Question 7

Optical fibre structure

Answer 7

A thin rod of high quality glass

Question 8

Medical uses of optical fibres

Answer 8

Endoscopes and CT scans

Question 9

CT scans dimensions

Answer 9

3d

Question 10

Endoscopy dimension

Answer 10

2d

Question 11

Advantages of endoscopy

Answer 11

Less harmful as X-rays are not used

Question 12

Disadvantages of endoscopy

Answer 12

Only specific areas can be scanned

Question 13

Advantages of CT scans

Answer 13

An overall image is produced

Question 14

Disadvantages of CT scans

Answer 14

X rays are damaging