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2. Light
is energy emitted by accelerating
electric charges, usually electrons.
Visible light is a very small portion of the
electromagnetic spectrum
is a form of electromagnetic wave with
a wavelength which can be detected by
the human eye.

3. Figure A Figure B
Activity 1: Dual Nature of Light
1.What happen to the beam of light as it passes
through the slits in Figure A? Figure B?

4. Figure A Figure B
Activity 1: Dual Property of Light
2. What kind of images formed by light
after passing through the two slits?

5. Figure A Figure B
Activity 1: Dual Property of Light
3. How does the beam light behave in both
cases?

6. Figure A Figure B
Activity 1: Dual Property of Light

7. Nature of
Light

8. The Wave Theory of Light
This theory states that light is a longitudinal
wave transmitted through an aether
In this theory, light is considered as an
Electromagnetic Wave(EM).
Christian Huygens

9. Electromagnetic Wave
 are waves that are created as a result of
vibrations between an electric field and
a magnetic field.

10. Characteristics of Light waves
1. Wavelength- is the length that one
cycle OR distance between 2 crests.
(Unit: Meter, m)
2. Frequency (f)- how often cycle of wave
repeats in one second OR number of
cycles per sec. (Unit: Hertz, Hz)
3. Velocity ( v) – the distance covered by the
wave in one second. Unit: m/s

11. 4. Period (T)- the duration of one
cycle. Unit: second, s
5. Wave Number- the number of
waves spread in a length of one meter.
6. Amplitude (A)- The distance from
the midline to the peak of wave.
Characteristics of Light waves

12. Supported by:
(Young’s Double Slit Experiment) ( Electromagnetism)

13. The Corpuscular Theory of Light
(Particle theory of light)
This theory states that light was composed of tiny
particles called corpuscles(little particles)
Sir Isaac Newton

14. 1. Photon has no mass and electric charge.
Characteristics of Light
particles(photon)
2. Photon carries electromagnetic energy
3. Photon travels at the speed of light in
vacuum; v= 3 x 10 m/s
8
4. Photons are always in motion.

15. 5. Photons can produces:
Infrared Light
Visible Light
Ultraviolet Light
X-rays
Characteristics of Light
particles(photon)

16. Photoelectric effect
 is the ejection of electrons from a
metal surface when light falls on it.

17. Supported by:

18. How important is
light in our daily
living?

19. Assessment
Directions:
Answer the following questions based on your own
understanding.( 5 points each)
1. Is it possible to see the dual nature of
light at the same time? Why?
2. How light behave as a wave?
3. How light behave as a particle?
4. How does electromagnetic waves explain
light as a wave?
5. How does photoelectric effect explain
light as a particles?

20. Assignment
Activity 2 Exploring How Light Travels (10 points)
Directions:
1. Go back to your front yard or backyard. Pick 3 best
selfie spots. Before posing for your camera, observe
your shadow as you go through those spots.
2. Take selfies facing different directions.
3. Upload your best and worst capture in your Physical
Science group chat on Messenger or Google
Classroom.