Optics Forum

Post thread

Threads

High School Why is the sky blue yet the light that reaches the earth white?

  • wasteofo2
  • · Replies 4 ·
Replies
4

High School Can Ice Act as a Converging Lens to Start a Fire?

  • tangur
  • · Replies 1 ·
Replies
1

Graduate Does reflected sunlight from east and west produce vertically polarized light in phase?

  • Ian Rumsey
  • · Replies 2 ·
Replies
2

Undergrad Why does red light invert through a cylinder but blue light doesn't?

  • tangur
  • · Replies 1 ·
Replies
1

Undergrad Rectangular aperture on Single slit diffraction

  • pacificmoon
  • · Replies 2 ·
Replies
2

Graduate What are solitons and how do they affect us?

  • Mk
  • · Replies 11 ·
Replies
11

Undergrad Measuring latex displacement in a cone with a rolling ball bearing

  • Oran
  • · Replies 7 ·
Replies
7

High School Understanding Snell's Law and Maxwell's Equations with EM Waves

  • 3.14lwy
  • · Replies 3 ·
Replies
3

High School Infra Rays: Sun or Human Body Wavelength?

  • no idea
  • · Replies 3 ·
Replies
3

High School Why does the thin-lens equation work?

  • twitch94301
  • · Replies 2 ·
Replies
2

Undergrad Diffraction Pattern Observed w/ Converging Light

  • retupmoc
  • · Replies 2 ·
Replies
2

Undergrad Why can't I see a red car in a completely dark room?

  • primal schemer
  • · Replies 13 ·
Replies
13

Graduate Truncating a Gaussian Beam: Effects on Intensity and Other Parameters?

  • belal
  • · Replies 2 ·
Replies
2

High School Does light have mass?

  • sunny86
  • · Replies 6 ·
Replies
6

Undergrad How can I determine the velocity of the ionosphere based on wave reflections?

  • AronH
  • · Replies 2 ·
Replies
2

High School Why do Searchlights Shorten ?

  • Bartholomew
  • · Replies 5 ·
Replies
5

High School There is no speed faster than the speed of light?

  • bayan
  • · Replies 2 ·
Replies
2

Undergrad Can the Formula for the Number of Images by Two Inclined Mirrors Be Proven?

  • shashank010288
  • · Replies 5 ·
Replies
5

High School Why can some pictures only be seen through polarizing film?

  • xenogizmo
  • · Replies 7 ·
Replies
7

Graduate Create Photonic Force with Flashlight?

  • Phymath
  • · Replies 11 ·
Replies
11

Undergrad Can We Stack Solar Panels to Increase Solar Energy Absorption?

  • chound
  • · Replies 6 ·
Replies
6

Undergrad Does light really speed up after passing through glass?

  • Jack
  • · Replies 108 ·
4
Replies
108

Graduate The speed of light, something new about it

  • Super_Saiyan
  • · Replies 4 ·
Replies
4

Graduate A photonic clock - absolute time

  • asprin
  • · Replies 23 ·
Replies
23

High School Reflected rays from two LEDs hitting the same point on paper

  • kdkdkd
  • · Replies 5 ·
Replies
5

Graduate Which is more linear, a frictionless or slightly frictional pendulum clock?

  • Loren Booda
  • · Replies 2 ·
Replies
2

Graduate What Liquids Have a Refractive Index Close to Silicone for Flow Visualization?

  • dtdtdt
  • · Replies 3 ·
Replies
3

High School Refraction and reflection when light hits glass or water at 0° and 90°

  • 7bear
  • · Replies 3 ·
Replies
3

Undergrad What is the Meaning of Vector Magnitude Symbols?

  • CinderBlockFist
  • · Replies 5 ·
Replies
5

Are Time and Light the Same Thing?

  • time zone
  • · Replies 6 ·
Replies
6

Undergrad A radio beacon @ the speed of light.

  • deckart
  • · Replies 8 ·
Replies
8

Undergrad Explaining the colors and bright center of a rainbow ring

  • Nereid
  • · Replies 11 ·
Replies
11

High School Why does total internal reflection occur at small angles in fiber optics?

  • ferrarilover2000
  • · Replies 3 ·
Replies
3

High School Why do car lightbulbs last so long despite vibration and heat?

  • Rothiemurchus
  • · Replies 15 ·
Replies
15

Graduate Can the Speed of Light Be Changed and What Does It Mean for Space Exploration?

  • plum
  • · Replies 305 ·
11
Replies
305

Undergrad Understanding Diffraction Grating: Factors Affecting Interference Patterns

  • franz32
  • · Replies 1 ·
Replies
1

High School Diameter of milky way is 1.0 *10^5 light years

  • lilydaisy15
  • · Replies 5 ·
Replies
5

Undergrad OPTICS: Thin Film Interference

  • n0_3sc
  • · Replies 1 ·
Replies
1

Graduate What Determines the Speed of Light and Its Limitations?

  • phenylalanine
  • · Replies 8 ·
Replies
8

Undergrad SI unit for luminous intensity

  • Brad Barker
  • · Replies 9 ·
Replies
9

Graduate What tells a photon what to do?

  • Metallicbeing
  • · Replies 4 ·
Replies
4

Undergrad Why is light speed constant regardless of observer velocity?

  • no idea
  • · Replies 4 ·
Replies
4

Graduate What Areas of the Electromagnetic Spectrum Can Be Lased?

  • Gonzolo
  • · Replies 10 ·
Replies
10

High School Why is brown not in the visible spectrum of light?

  • daveed
  • · Replies 17 ·
Replies
17

Undergrad Why does moving toward or away from light change its color?

  • UglyEd
  • · Replies 12 ·
Replies
12

Graduate Why is the momentum of light equal to E/c?

  • Cheman
  • · Replies 12 ·
Replies
12

Graduate If light has no mass, why is it affected by gravity?

  • phenylalanine
  • · Replies 24 ·
Replies
24

High School What makes light bright and does it slow down in air?

  • neoweb
  • · Replies 19 ·
Replies
19

Undergrad Converging Lens Magnification Problem

  • soccerjayl
  • · Replies 2 ·
Replies
2

Graduate Zero to Light Speed - Atom's Point of View

  • what_are_electrons
  • · Replies 2 ·
Replies
2

Undergrad Does the light transform a matter?

  • canopus
  • · Replies 21 ·
Replies
21

Graduate Is time absolute for the photon?

  • Scott Sieger
  • · Replies 9 ·
Replies
9

Graduate What happens to the electron's EM field when it emits a photon?

  • kichigai
  • · Replies 9 ·
Replies
9

High School Back in time by going faster than light?

  • Zeteg
  • · Replies 6 ·
Replies
6

High School What Is the Refraction Index of Paper?

  • alpha_wolf
  • · Replies 3 ·
Replies
3

Graduate “aumic” theory and the propagation of light.

  • McQueen
  • · Replies 33 ·
2
Replies
33

High School What is a light year?

  • lakshmi
  • · Replies 9 ·
Replies
9

Undergrad Lightspeed is 0 I will proof that

  • rudeonline
  • · Replies 41 ·
2
Replies
41

Graduate Finding a good reference on coupled mode theory for cylindrical waveguides

  • Claude Bile
  • · Replies 2 ·
Replies
2

Undergrad Matter as well as energy can be neither created nor destroyed

  • Sidewalk
  • · Replies 9 ·
Replies
9

High School What are the enlarging and reducing devices on Xerox machines?

  • franz32
  • · Replies 3 ·
Replies
3

Undergrad What is the meaning of N in wave optics of reflection?

  • niko2000
  • · Replies 2 ·
Replies
2

Undergrad Optical Fibers-Min. Bend Radius

  • Tea
  • · Replies 2 ·
Replies
2

Graduate Faster-than-light experiments at home?

  • Gonzolo
  • · Replies 30 ·
2
Replies
30

Undergrad Does light emitted by a moving object travel at c or faster?

  • Tree Penguin
  • · Replies 9 ·
Replies
9

High School Can Concave Mirrors Focus Sunlight and How Do Pinhole Glasses Work?

  • franz32
  • · Replies 3 ·
Replies
3

High School How do prisms separate colors in rainbows?

  • Gara
  • · Replies 3 ·
Replies
3

Undergrad Photons transfer energy to the atoms in the metal plate?

  • wolram
  • · Replies 11 ·
Replies
11

Graduate The photonic theory of everything.

  • McQueen
  • · Replies 11 ·
Replies
11

Undergrad Intensity of laser beam / Inverse square law

  • stimpyzu
  • · Replies 5 ·
Replies
5

Graduate Why is light visible at light speed but sound isn't?

  • Clausius2
  • · Replies 14 ·
Replies
14

I have a theory that might work with LIGHT traveling

  • monkeydude9999
  • · Replies 7 ·
Replies
7

Graduate How can light have measurable velocity if it has no mass?

  • omin
  • · Replies 13 ·
Replies
13

Graduate Does light have momentum and exert force in general relativity?

  • woodysooner
  • · Replies 15 ·
Replies
15

Graduate Speed of Light: Has It Always Been Constant?

  • jamie
  • · Replies 4 ·
Replies
4

Graduate Is Gravity Driving the Expansion of the Universe?

  • lazy01001
  • · Replies 1 ·
Replies
1

Undergrad Speed of light a saddlept on a function

  • woodysooner
  • · Replies 10 ·
Replies
10

Photons hitting the metal of the bike

  • jumbo400
  • · Replies 6 ·
Replies
6

Undergrad Why can't people in a dark room see me in the lit room?

  • Gara
  • · Replies 19 ·
Replies
19

Graduate Why doesn't the photon escape a moving light clock?

  • Alexander
  • · Replies 19 ·
Replies
19

High School Why are car brake lights red and how does wavelength relate?

  • Omid
  • · Replies 7 ·
Replies
7

Graduate Polarized light (Rival conventions)

  • Galileo
  • · Replies 3 ·
Replies
3

Undergrad Particles traveling faster than light

  • Rasine
  • · Replies 8 ·
Replies
8

Graduate Understanding Bremsstrahlung and Cerenkov Emission

  • ArmoSkater87
  • · Replies 4 ·
Replies
4

Graduate Why do photons travel at light speed if they have mass?

  • Kamataat
  • · Replies 7 ·
Replies
7

High School Lasers are being used to do eye correction

  • Yggdrasil
  • · Replies 12 ·
Replies
12

High School What causes lightning to strike between clouds and ground?

  • wasteofo2
  • · Replies 8 ·
Replies
8

Graduate Wavelength of Light: What is the Nature of This Phenomenon?

  • wespe
  • · Replies 3 ·
Replies
3

High School Can a Pearl Necklace Explain the Wave-Particle Duality of Light?

  • AcEY
  • · Replies 6 ·
Replies
6

Graduate Ray Fleming's sonoluminescence FTL propulsion theory

  • Whitestar
  • · Replies 5 ·
Replies
5

Undergrad What distinguishes photons from other particles in terms of mass and speed?

  • imi
  • · Replies 2 ·
Replies
2

Undergrad Can Interferance cause magnification?

  • pallidin
  • · Replies 6 ·
Replies
6

Graduate Forged Bosonic System = Photon?

  • PRodQuanta
  • · Replies 3 ·
Replies
3

Graduate The Doppler Effect and the Velocity of Light in Einstein's Theory

  • David
  • · Replies 98 ·
4
Replies
98

Graduate Joao Maguijo/Faster Than Light

  • automaton
  • · Replies 3 ·
Replies
3

Graduate Measuring The Relative Velocity Of Light

  • grounded
  • · Replies 253 ·
9
Replies
253

Undergrad How do black holes attract light with no mass?

  • NanakiXIII
  • · Replies 10 ·
Replies
10

Graduate No postulate of light is violated in Galilean transformation.

  • geistkiesel
  • · Replies 74 ·
3
Replies
74

What is Light and How Does it Work? Check Out This Website!

  • nakayama
  • · Replies 8 ·
Replies
8

Undergrad Do tropical lightning strikes create AC DC and neutral currents in Earth?

  • 02380
  • · Replies 4 ·
Replies
4