chapter 10- reflection and refraction of light

Question 1

conditions for reflections

Answer 1

• the angle of incidence is the angle between the incident ray and the normal
• the angle of reflection is the angle between the reflected ray and the normal
  -image produced is upright, laterally inverted and virtual

Question 2

refraction

Answer 2

change of direction of waves when they travel across a boundary from one medium to another

Question 3

light air-glass

Answer 3

• angle of refraction is smaller
  -towards the normal
• speed of light decreased

Question 4

light glass-air

Answer 4

• angle of refraction is bigger
• away from the normal
• speed of light is increased

Question 5

refractive index

Answer 5

a measure of how much a medium can refract a light ray

Question 6

total internal reflection condintions

Answer 6

-angle of incidence of a light ray in a transparent medium is greater than the critical angle
- more dense to less dense medium

Question 7

dispersion

Answer 7

-refraction by a prism, formation of a continuous spectrum
-when a white beam of light goes through a prism

Question 8

optical fibres

Answer 8

-visible light and infared can be transmitted through optical fibres