lk

3.  We see things because they reflect
light into our eyes:
Homework

5. Part 1 – Properties of Light
 Light travels in straight lines:
Laser

7. Part 2 - Reflection
 Reflection from a mirror:
Normal
Incident ray Reflected ray
Angle of incidence Angle of
reflection
Mirror

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 !!!

11. Introduction
Refraction is the bending of light
when the light passes from one medium to another.
air
glass

13. Introduction
Useful words to describe refraction of light
angle of incidence
normal
air
glass
angle of refraction

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.

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.

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