This document discusses the dual nature of light by reviewing the electromagnetic spectrum and the historical development of light theories. It describes how Newton viewed light as particles while Young provided evidence of its wave-like properties through his double slit experiment. The experiment showed interference patterns produced by light passing through two slits, supporting the hypothesis that light behaves as waves. Furthermore, the document notes how the double slit experiment helped understand the wave theory of light and established its dual nature as both a particle and wave.

1. PRESENTED BY: DEFRIEL L.
TARIPE
THE
NATURE
OF LIGHT

2. OBJECTIVES
Today's Discussion
#2 Understand the DUAL NATURE OF
LIGHT
#1 Understanding the Nature of Light

3. ACTIVITY
With a partner, list down all
the possible sources of
light.

4. Maybe you have thought of....

5. LIGHT PRECEDES LIGHT

6. BEFORE WE DEFINE LIGHT....
Lets talk about the electromagnetic
spectrum.
Trace the historical development of the
theories that explain the nature of
light.

7. A REVIEW OF ELECTROMAGNETIC WAVES
These are waves produced
by oscillating charges.
They can travel through a
vacuum or material
substance.
They are transverse in
nature.
There are seven identified
classes of electromagnetic
waves.

8. ELECTROMAGNETIC SPECTRUM

9. SO WHAT
IS LIGHT?

10. Newton believed that particles of
matter exert equal force to the
particles of light regardless of its
color. He then explained that when
light particles passed through an
interface of matter, the colors of
light which have different mass
and inertia will be deflected at
varying degrees.

11. https://youtu.be/0b0axfyJ4oo?si=eBOVjBEwfAEr7Dp8

12. In 1801, an English physicist named
Thomas Young performed an
experiment that strongly inferred
the wave-like nature of light.
Because he believed that light was
composed of waves, Young
reasoned that some type of
interaction would occur when two
light waves met.

13. THOMAS YOUNG AND THE DOUBLE SLIT EXPERIMENT
EVIDENCES FOR WAVES
Young's double slit experiment uses two
coherent sources of light placed at a small
distance apart. Usually, only a few orders
of magnitude greater than the wavelength
of light are used. Young's double slit
experiment helped in understanding the
wave theory of light, which is explained
with the help of a diagram.

14. https://youtu.be/pJx3dQxcHaQ?si=iGFl5LSNjHgXqZUq
THE DOUBLE SLIDE EXPERIMENT

15. THE DUAL
NATURE OF
LIGHT

17. LIGHT AS A WAVE

18. THANK
YOU FOR
LISTENING