3. We see things because they reflect
light into our eyes:
Homework
4.
5. Part 1 – Properties of Light
Light travels in straight lines:
Laser
6.
7. Part 2 - Reflection
Reflection from a mirror:
Normal
Incident ray Reflected ray
Angle of incidence Angle of
reflection
Mirror
8.
9. The Law of Reflection
Angle of incidence = Angle of reflection
In other words, light gets reflected from a surface at ____ _____
angle it hits it.
The same !!!
13. Introduction
Useful words to describe refraction of light
angle of incidence
normal
air
glass
angle of refraction
14.
15. Introduction
From a denser to a less dense medium
• e.g. from water to air
normal
water
air
• Light is bent away from the normal.
16.
17. Introduction
From a less dense to a denser medium
• e.g. from air to glass
normal
air
glass
• Light is bent towards the normal.
18.
19. B) REFRACTION OF LIGHT THROUGH A RECTANGULAR
GLASS
SLAB :-
Normal
Incident ray
i
Air
Glass
r
Rectangular glass slab
Glass
Air
e
Emergent ray
Normal
