Qualitative description of mirror and lens. Ray diagram in mirror

1. FORCE, MOTION
AND ENERGY
Quarter 2 Week 3
Code: S10FE-2g-50

2. LIGHT: MIRROR
AND LENS
Reflection of Light in Mirror

3. CONTENT STANDARD
The learners demonstrate an
understanding of the image(s)
formed by the different types of
mirrors and lenses.

4. LEARNING COMPETENCY
Predict the qualitative
characteristics (orientation, type
and magnification) of images
formed by the plane and curved
mirrors and lenses

5. Let’s analyze!
What can you see
when you look at
the mirror?
or in a polished
metal?
or in a still/ calm
pool of water
IMAGES or image reflecting objects

6. Mirror
A smooth reflecting surface, usually made of
polished metal or glass that has been coated with
metallic substances. There are two types of mirror
plane mirror curved mirror

7. REFLECTION
-is the bouncing off the light
when it hits the surface like a
plane mirror. In the diagram,
we use plane mirror and locate
the object distance, p and the
image distance q and found out
that p equals q. In the plane
mirror, the image appears as if
it behind the mirror but actually
not, so the image is virtual.

8. REFLECTION
The value therefore of image
distance (q) is negative. The
height of the image, h’ in
plane mirror is always the
same as the height of the
object, thus its magnification,
M is 1.

9. REFLECTION
Incident Ray – The ray of light approaching the
mirror represented by an arrow approaching an
optical element like mirror.
Reflected Ray – is the ray of light that leaves the
mirror and is represented by an arrow pointing
away from the mirror.

10. REFLECTION
Normal line – an imaginary line that can be
drawn perpendicular to the surface of the mirror
at the point of incidence where the ray strikes the
mirror.

11. REFLECTION
The normal line, the incident ray and the
reflected ray lie on the same plane.

12. Angle of Incidence vs. Angle of Reflection

13. Angle of Incidence vs. Angle of Reflection

14. Angle of Incidence vs. Angle of Reflection
Observation
Angle of Incidence Angle of Reflection
20 degree
40 degree
60 degree
20 degrees
40 degrees
60 degrees

15. Angle of Incidence vs. Angle of Reflection
The angle between the incident ray and the normal line
is know as angle of incidence θi, and the angle
between the reflected ray and normal line is the angle
of reflection θr.
In the activity presented at the video, we can say that
the angle of incidence is equal at the angle of
reflection, and this is the Law of Reflection.

16. TYPES OF REFLECTION
1. Specular or Regular Reflection
This is the reflection of light in the smooth
surfaces such as the mirrors or a calm body
of water.

17. TYPES OF REFLECTION
1. Specular or Regular Reflection

18. TYPES OF REFLECTION
2. Diffused or Irregular Reflection
This the reflection of light on rough surfaces
such as clothing, paper, wavy water and the
asphalt roadway.

19. TYPES OF REFLECTION
2. Diffused or Irregular Reflection

20. CURVED MIRRORS

21. CURVED MIRRORS

22. RAY DIAGRAMMING
F
C V
Vertex
Principal Axis
Center Focus
Concave Mirror

23. Describing the IMAGE
formed
L
O
S
T
- Location of the image
- Orientation of the image
Inverted or Upright
- Size of the image
smaller, enlarged, diminish
- Type of the image
Virtual / Real

24. RAY DIAGRAMMING- Concave
Mirror
F
C
V
Four Principal Rays
a. P-F ray. A ray of light parallel to the
principal axis, hit the mirror, then
reflected through the focus.
b. F-P ray. From top of object, A ray of
light passing through the focus, hit
the mirror, reflected parallel to the
principal axis
c. C-C ray. A ray of light passing
through the center of curvature,
back along its own path.
d. V ray. A ray of light directed
towards the vertex reflects at equal
angle from the principal axis.
object
L
O
S
T
Image found between C and F
inverted
Smaller than the object
Real image

25. RAY DIAGRAMMING
C
F
V
Vertex
Principal Axis
Focus Center
Convex Mirror

26. RAY DIAGRAMMING- Convex Mirror
C
F
V
Four Principal Rays
a. P-F ray. A ray of light parallel to the
principal axis, hit the mirror, then
reflected through the focus.
b. F-P ray. From top of object, A ray of
light passing through the focus, hit
the mirror, reflected parallel to the
principal axis
c. C-C ray. A ray of light passing
through the center of curvature,
back along its own path.
d. V ray. A ray of light directed
towards the vertex reflects at equal
angle from the principal axis.
object image
L
O
S
T
Image found between V and F
Erect, upright
Smaller than the object
Virtual image

27. CORRECT or INCORRECT
1. The incident ray and the reflected ray are the
same
2. A mirror is an optical device that can reflect light.
3. The angle of incidence is equal to the angle of
reflection.
INCORRECT
CORRECT
CORRECT

28. CORRECT or INCORRECT
4. The image formed at mirror is called virtual image
5. The distance and height of object is not the same
as the height and distance of image formed at the
mirror
INCORRECT
CORRECT

29. Pls be reminded!

30. Reference
Science 10
Self-Learning Module
Pages 20-25

31. Next

32. PREPARED BY:
Mr. Rowel V. Engreso
Science Teacher