2. UNLOCKING OF
DIFFICUTIES
Reflection of light- is
the turning back of light
into the same medium
after striking it.
Normal line- a line
perpendicular to the
surface at the point of
incidence.
Incident Ray - the
ray that strike the
surface.
Angle of incidence- the
angle between the
normal and the incident
ray.
Angle of reflection-the angle
between the reflected ray and
the normal.
Reflected ray-the ray that
rebounds from the surface.
5. Point the flashlight in the mirror, observe.
Write one sentence that will define
reflection based on your observation.
6. Station 2
Stack of Coins in front of a
plane mirror.
Using a ruler, measure the
height and width of the stack
of coins.
Measure also the height
and width of the image as
seen on the mirror.
Record all measurements in the
table.
Description Object Image
Height (cm)
Width (cm)
How do the height and
width of the object
compare with the height
and width of the image?
7. Study the figure of reflection of
light on plane mirror
Station 3
a. Compare the angle
of reflection and the
angle of incidence
b. location of incident
ray, normal, and the
reflected ray.
8. Study the figure of reflection of
light on plane mirror
Station 4
a. Compare the angle
of reflection and the
angle of incidence
b. location of incident
ray, normal, and the
reflected ray.
9. Things to Ponder : Reflection of Light
Definition Reflection is the
bouncing off light rays
when it hits a surface
like plane mirror.
Laws of
Reflection
The angle of
incidence is equal to
the angle of reflection.
<i = <r
The incident ray,
normal, and reflected
ray lie in one plane.
Reflection of Light
Definition
Laws of
Reflection
10. The different
colors of
flowers, birds,
etc. are result
of reflection of
light
Mirror
reflect light
to form an
image of an
object.
Reflection of
light waves
used by the
human eye to
see.
Application of reflection of light
11. Light reflects off in
still water like pools
or lakes.
TRIVIA: ancient
people used still
water in lakes and
rivers to see their
reflection.
12. For European
folklore, reflection in
mirrors were often
associated with
ghosts and
apparitions, that
many believed that it
played a significant
role in shaping the
way that different
culture sees
themselves and the
world around them.
For some other
culture like the
African cultures,
they believed that
mirrors can help
trap the soul or
capture person’s
image.
Ancient civilization
believed that
mirrors had the
power to reflect the
divine used in
ceremonies and
religious practices.
Application of reflection of light
13. Read the questions carefully and write the letter of the
correct answer.
1. Which is NOT a characteristic of a plane mirror?
A. Real
B. Upright
C. Laterally reversed
D. same size as the object
2. A ray of light is incident at 450
,what is its angle of
reflection?
A. 22.50 B. 350 C. 450 D. 900
14. Read the questions carefully and write the letter of the
correct answer.
3. As indicated by the hands of the clock without
numbers, the real time is 9:30. What is the time indicated
in its image if the clock is placed in front of a plane
mirror.
A. 2:30 B. 3:30 C. 9:30 D. 10:30
4. If you placed a number chart in front of a plane mirror, what
numbers will you read properly in the mirror?
A. 0,1,6,8, and 9
B. 0,1, and 6
C. 6 and 9
D. 0 and 8
15. Read the questions carefully and write the letter of the
correct answer.
5. A man is 1.4 m tall. What minimum size of a plane mirror
does he need to see his full self?
A. 0.7 m
B. C. >1.4 m
C. 1.4 m
D. depends on his distance in front of the mirror
1. A
2. C
3. B
4. D
5. A
16. ENRICHMENT
In your notebook answer the
question below;
A ray of light strikes a surface
and is reflected so that the angle
of incident ray and the reflected
ray is 300,
(a) What is the angle of
incidence?
(b) What is the angle of
reflection?
