newton s particle theory of light l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
NEWTON’S PARTICLE THEORY OF LIGHT PowerPoint Presentation
Download Presentation
NEWTON’S PARTICLE THEORY OF LIGHT

Loading in 2 Seconds...

play fullscreen
1 / 18

NEWTON’S PARTICLE THEORY OF LIGHT - PowerPoint PPT Presentation


  • 281 Views
  • Uploaded on

NEWTON’S PARTICLE THEORY OF LIGHT. Light is made up of little particles. They obey the same laws of physics as other masses like baseballs and planets. They are tiny so the particles in two intersecting beams do not scatter off each other. PARTICLE THEORY OF REFRACTION .

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'NEWTON’S PARTICLE THEORY OF LIGHT' - jacob


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
newton s particle theory of light
NEWTON’S PARTICLE THEORY OF LIGHT

Light is made up of little particles.

They obey the same laws of physics as other masses

like baseballs and planets.

They are tiny so the particles in two intersecting

beams do not scatter off each other.

particle theory of refraction
PARTICLE THEORY OF REFRACTION

A light particle deep within a medium

experiences no net force.

Near an interface, e.g. between air and

water, light particles experience an

attractive force towards the water.

Could this be the cause of refraction?

slide3

vpar

vpar

qi

vair

air

water

qr

vwater

newton s explanation of snell s law
NEWTON’S EXPLANATION OF SNELL’S LAW

sin(qi) = vpar/vair

sin(qr) = vpar/vwater

sin(qi)/sin(qr) = vwater/vair

other properties
OTHER PROPERTIES

Colors

Polarization

decisive test of particle theory

water-filled tube

Decisive Test of Particle Theory

fixed mirror

source

rotating

mirror

air

water

wave motion
WAVE MOTION

A wave is a pattern, or shape, or disturbance,

traveling through a medium.

Examples:

Sound is a pressure wave in air.

Sideways vibration of stretched string.

Football stadium “wave”.

torsional waves
TORSIONAL WAVES

Waves reflect from ends in this example

also.

superposition
SUPERPOSITION

When two wave amplitudes occur at the same point,

they simply add. They do not scatter from each other.

Example: Torsion waves passing through

each other.

periodic wave speed
PERIODIC WAVE SPEED

T = period of rope motion. f = frequency = 1/T

v = wave speed

Wavelength = l = distance between wave crests

Basic relation: v = distance moved/time = l/T = fl

Example: WTJU frequency = 91 MHz.

l = c/f = 3*108/0.9*108 = 3.3m

refraction of waves

r

lr

REFRACTION OF WAVES

li

i

sin(i)/sin(r) = li/lr = fli/flr = vi/vr

refraction
REFRACTION

fast

slow

fast

interference
INTERFERENCE

Constructive Interference:

Destructive Interference

young two slit interference pattern
YOUNG TWO-SLIT INTERFERENCE PATTERN

Bright

Dim

Bright

Dim

path difference

l

soap films
SOAP FILMS

film thickness = t

path difference ~ 2t and varies as film drains

and thins. Colored horizontal fringes can be seen.

color and wavelength
COLOR AND WAVELENGTH

Color Wavelength (nm)

Red 650

Yellow 580

Green 540

Blue 470

Violet 440