1. The document discusses light reflection, including the properties of plane mirrors. It describes the angle of incidence being equal to the angle of reflection, and how light reflects off smooth versus rough surfaces. 2. Key terms discussed include normal, incident ray, reflected ray, angle of incidence, angle of reflection, specular reflection, and diffuse reflection. 3. Examples demonstrate how to calculate the angle of incidence and reflection from diagrams of light reflecting off mirrors.

2. Quarter 2- Module 6
Light
Objective: Investigate the reflection
properties of light using plane mirrors.

3. Content Standard: The learners demonstrate an
understanding of the images formed by the different
types of mirrors and lenses.
Predict the qualitative characteristics (orientation, type,
and magnification) of images formed by plane and
curved mirrors and lenses. (S10-FE-Iig-50)
MELC 1: Investigate the reflection properties of light
using plane mirrors.

4. Visible Light

5. Visible Light
❏also known as white light.
❏Only one kind of light, or electromagnetic
radiation.

6. Visible Light
⮚ consists of a collection of component colors.
- Red
- Orange
- Yellow
- Green
- Blue
- Indigo
- Violet

7. Dispersion
❏the spreading of white light into its full
spectrum of wavelengths.
❏Refraction is responsible for dispersion
in rainbows

8. Dispersion
❏As white light enters the air-glass interface,
different color light exhibit different
refractive indices and thus separates into
the visible color lights.
❏a phenomenon in which a prism separates
white light into its component colors.
❏it occurs because of the bending of light.

9. Visible
Light
A rainbow is an excellent demonstration of
the dispersion of light and one more piece
of evidence that visible light is composed of
a spectrum of wavelengths

10. Characteristics of white light
White light – the presence of all
colors
- ROYGBIV
Black – an absence of all colors

11. COLORS OF LIGHT COLORS OF PIGMENT

12. Application

13. Application
Other Colors:
Orange evokes enthusiasm and is a great color for exercise rooms.
Black: is best used as an accent color to give depth to a scheme.
Brown: is earthy and makes people feel relaxed and comfortable.
Grey: is versatile, and influences feelings of security and
intelligence.
The color we choose for our surroundings can have a powerful
impact on our moods.

14. Yellow – The depression killer.
❏People with depression could also benefit
from yellow color therapy.
❏People with a difficult digestion can treat
this with yellow light. This color is
associated with the stomach, liver, and
intestines.

15. 1. Light
2. Object
3. Eyes
Three things are needed for us
to see

16. 1. Light 2. Object 3. Eyes
Three things are needed for us to see

17. 1. Light 2. Object 3. Eyes
Three things are needed for us to see
RED- Reflected
Other colors-
absorbed

18. ❏colors of most objects are
due to selective absorption
and direction of light.
❏When a red rose is struck by
white light, it reflects red
light back to your eyes and
absorbs all other colors.
SELECTIVE ABSORPTION AND REFLECTION

19. SELECTIVE ABSORPTION AND REFLECTION

20. Reflection of light
❏bouncing back of light waves as it hits a
barrier where they could not pass
through.

21. Reflection

22. Reflection of light
Normal
Normal - may be defined as a
line that is perpendicular to the
mirror at the point of
incidence.
The normal is always
represented by a dotted line.
mirror

23. Reflection of light
Incident Ray
The ray of light
that falls on the
surface of a mirror
is called an
incident ray.
mirror

24. Reflection of light
Reflected Ray
When the incident ray falls on
the surface of a mirror, the
mirror sends it back in another
direction (in the same
medium).
The ray of light which is sent
back by the mirror is called a
reflected ray.
mirror

25. Reflection of light
Angle of Incidence
The angle of incidence
may be defined as the
angle which is made by
the incident ray with
normal at the point of
incident. It is denoted by
the letter i. mirror

26. Reflection of light
Angle of Reflection
The angle of reflection may
be defined as the angle
which is made by the
reflected ray with normal at
the point of reflection. It is
denoted by the letter r.
mirror

27. Reflection of light
Angle of Reflection
The angle of reflection
may be defined as the
angle which is made by
the reflected ray with
normal at the point of
reflection. It is denoted by
the letter r. mirror

28. Reflection of light
❖Incident ray (ir) - ray that that strikes or
hits the surface
❖Reflected ray (rr) – ray that leaves the
surface
- bounced wave
❖Normal ray – imaginary line
perpendicular to the reflecting surface

29. Reflection of light
❖θi = angle of incidence
- angle form between normal
and incident ray
❖θr = angle of reflection
- angle form between
normal and reflected ray

30. Laws of reflection
The laws of reflection state that
1. The incident ray, the reflected ray and the
normal all lie in the same plane.
1. The angle of incidence(θi) is equal to the
angle of reflection (θr).
θi = θr

31. Law of Reflection
angle of incidence = angle of Reflection
θi = θr
mirror
63° 63°
θi θr

32. •Example
1.θi =
2.θr =
45°

33. Let’s try this!
Light is incident on a flat
surface, making an angle of 10o with
that surface, as shown in the figure to
the right.
(a) What is the angle of incidence?
(b) What is the angle of reflection?
(c) Sketch the path of the reflected
beam on the diagram.

34. 1. θi
2. Θr
3. A
4. B
5. C
A B C
Let’s try this!

35. 1.Θi - 34°
2.Θr - 34°
3.A - incident ray
4.B - normal
5.C - reflected ray
A B C

36. Types of reflection
Specular or regular
reflection
• Occurs in smooth surface
• Parallel light rays of an object fall
on the surface at the same angle
of incidence.
• Gives clear image
• Ex. Mirror, calm water
1. Specular or regular reflection
2. Diffused or irregular reflection

37. Types of reflection
Diffused or irregular reflection
• Occurs in rough surface
•Parallel light rays of an object
fall on the surface at different
angles of incidence as the
surface is rough.
• Gives the blurred image
•Ex. Sandy surface, rippled
water

38. Summary

39. 42°
Identify the
following:
1.N
2.I
3.R
4.Angle of
reflection
5.Angle of
incidence
Formative Test

40. 42°
Identify the
following:
1.N - normal
2.I- incident ray
3.R – reflected ray
4.Angle of reflection
= 48°
5. Angle of incidence
= 48°
Formative Test