3. 1. Have you seen a mirror?
2. Do you have a mirror at home?
3. What is the purpose of using a
mirror?
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QUESTIONS:
4. 1. What did you see on the mirror?
2. Have you ever wondered how mirrors
form images?
3. What do you think will be the content of
our discussion for today?
4. What do you know about reflection?
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QUESTIONS:
6. OBJECTIVES:
✘ Define the terms reflection, angle of
incidence, angle of reflection, incident ray,
and reflected ray.
✘ Compare the angle of incidence and angle
of reflection, and state the law of
reflection.
✘ State the importance of reflection in daily
life.
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13. PROCEDURE:
1. Let the mirror stand vertically
along the edge of the paper
protractor as shown in figure 1.
Use the clay to support the
plane mirror.
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15. PROCEDURE:
2. Position the laser beam such
that it hits the mirror at an angle
of 10⁰ with the normal line.
Record your measurement in a
table similar to table 1.
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35. LET’S ELABORATE!
✘ Incident Ray – is the ray of
light approaching the mirror
represented by an arrow
approaching the mirror.
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36. LET’S ELABORATE!
✘ Reflected Ray – is the ray of
light which leaves the
mirror and is represented
by an arrow pointing away
from the mirror.
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37. LET’S ELABORATE!
✘ Normal Line – is 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.
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51. Identification
11-15. Light is incident on a flat
surface (a plane mirror),
making an angle of 25⁰ with that
of the surface.
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52. Problem Solving
a. Find the angle of incidence.
b. Find the angle of reflection.
c. Find the angle made by the reflected
ray and the surface.
d. Find the angle made by the incident
and reflected ray.
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