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Undergrad Do coherent waves need the same frequency or just constant phase difference?

  • khurram usman
  • · Replies 3 ·
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3

Undergrad If a car travels at light speed, do its headlights move faster than light?

  • tutondrius
  • · Replies 5 ·
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5

Undergrad Can speed of light be faster with this?

  • Archangel
  • · Replies 4 ·
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4

Undergrad Why does the speed of light slow down in denser mediums?

  • quantizedzeus
  • · Replies 13 ·
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13

High School Distance From Eye VS Visible Size

  • smengler
  • · Replies 6 ·
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6

High School Polarized Light: Understanding How Polarization Occurs

  • phabos
  • · Replies 2 ·
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2

Graduate Laser bouncing inside polycarbonate cube: predicting transmission

  • Curl
  • · Replies 1 ·
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1

Undergrad Can someone tell me what is the best collimation material for this application?

  • rasgar
  • · Replies 5 ·
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5

Undergrad Could a rocket come close to the speed of light?

  • Pauru
  • · Replies 18 ·
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18

Graduate Transverse mode output from a multimode fiber using TEM00 laser source?

  • babreopti
  • · Replies 2 ·
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2

High School Does a reflected green laser pointer beam get hot?

  • TechnoVirus
  • · Replies 1 ·
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1

Undergrad Burning Elements - Visible Light Spectrum

  • MadmanMurray
  • · Replies 2 ·
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2

High School What happens to light when it hits an object?

  • TheNavigator
  • · Replies 8 ·
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8

Undergrad What causes the shadow below a whirlpool in a pool?

  • Big_E_Pat
  • · Replies 1 ·
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1

If i can see him, can he see me?

  • 1MileCrash
  • · Replies 4 ·
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4

High School When I am looking with my sunglasses to PC display I see darker

  • agentas
  • · Replies 4 ·
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4

Undergrad Why longer wave diffracts more?

  • kelvin490
  • · Replies 1 ·
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1

Undergrad Why is there less reflection from train windows in bright light?

  • vkash
  • · Replies 4 ·
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4

Graduate Fibre Misalignment and Light Coupling

  • irfanskp
  • · Replies 3 ·
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3

Undergrad How Does Light Interact with Matter in Our Atmosphere?

  • gemma786
  • · Replies 1 ·
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1

Undergrad Does gravity affect light and does light have mass?

  • Trevormbarker
  • · Replies 21 ·
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21

Undergrad Inverse perspective mapping equations

  • darie2808
  • · Replies 4 ·
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4

Undergrad Does destructive interference contradict the law of conservation of energy?

  • ifanyonecan
  • · Replies 16 ·
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16

Interference of fibre optic signals with mobile phones' microwaves?

  • dennisrobert
  • · Replies 6 ·
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6

High School Evidence that light is a transverse wave?

  • deepthishan
  • · Replies 2 ·
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2

Undergrad Understanding Rainbow Dispersion in Glass and Mirrors

  • expert_vision
  • · Replies 8 ·
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8

Graduate What really cause light to appear slower in media?

  • EHT
  • · Replies 4 ·
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4

High School Sunglasses + Plane Window = Colors?

  • gsingh2011
  • · Replies 14 ·
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14

High School Direction when the magnitude of the instantaneous velocity is 0

  • Ikari
  • · Replies 16 ·
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16

High School Why do green lasers rays are visible?

  • fluidistic
  • · Replies 15 ·
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15

Undergrad Why does the colour wheel exist?

  • thegreenlaser
  • · Replies 66 ·
3
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66

Graduate Does a photon at rest have different mass and lifespan than one traveling at c?

  • YoungDreamer
  • · Replies 4 ·
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4

Graduate How could one measure degree of coherence with Fresnel birprism?

  • BrunoIdeas
  • · Replies 1 ·
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1

High School What causes light to become brighter?

  • MegaDeth
  • · Replies 9 ·
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9

High School Why Do Objects Appear As We See Them?

  • nouveau_riche
  • · Replies 5 ·
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5

High School Can Wave Reflection Interfere with Communication?

  • Googl
  • · Replies 7 ·
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7

Graduate Trapping a omni-directional light source within an uni-directional light source

  • Ninjacocoa
  • · Replies 3 ·
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3

Undergrad Airy Disc Formula: Why Does it Include 1.22?

  • agentas
  • · Replies 1 ·
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1

Undergrad The effect of Earth's Roatation on Flight

  • alon
  • · Replies 18 ·
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18

Graduate Is a lens necessary for producing focused images?

  • luckis11
  • · Replies 11 ·
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11

Graduate How is energy shared in plasma between particles and photons?

  • Spinnor
  • · Replies 2 ·
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2

High School What Happens to Photographic Clarity Without a Lens?

  • luckis11
  • · Replies 24 ·
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24

Undergrad Is Collimating a Small LED Beam Possible with Various Lenses?

  • SMD1990
  • · Replies 19 ·
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19

High School Can Lightning Strike on a Car Kill You?

  • Jim Kata
  • · Replies 4 ·
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4

High School Why is there a rim of blue light around white streetlights

  • Strangeline
  • · Replies 1 ·
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1

High School Would an eye as large as a telescope lens see as far?

  • physickkksss
  • · Replies 10 ·
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10

Graduate What Does a Photon Waveform Look Like?

  • mermeladeK
  • · Replies 14 ·
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14

High School Why does a plane glass not separte light? (but a prism does)

  • physickkksss
  • · Replies 3 ·
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3

Undergrad Why does E=mc² give a nonzero mass for a photon?

  • Sothh
  • · Replies 11 ·
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11

Graduate When the light enters calcite it is splitting in two rays

  • agentas
  • · Replies 4 ·
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4

High School Are Colors Connected to Energy and Infrared Vision?

  • sankalpmittal
  • · Replies 23 ·
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23

High School If we saw the x-rays could we see whatever the x-rays machines see?

  • Ynsgfnsv
  • · Replies 1 ·
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1

Graduate What do I see if I walk forward through a superdense transparent medium?

  • danR
  • · Replies 6 ·
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6

Graduate How to cancel a split image - is it actually possible?

  • tarius
  • · Replies 6 ·
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6

Graduate Can the speed of light be measured in MeV per photon?

  • EMFsmith
  • · Replies 3 ·
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3

Undergrad Dimensions and relative magnitude

  • Nano-Passion
  • · Replies 4 ·
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4

Undergrad How Many Photons Does a 100 W Bulb Emit Per Second?

  • Brammo
  • · Replies 5 ·
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5

Undergrad Why does a high optical carrier feq. provide higher transmission rate?

  • gsmsmldb
  • · Replies 8 ·
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8

Graduate How can light accelerate to such a huge velocity?

  • aby001234
  • · Replies 3 ·
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3

Graduate Classical light diffraction round corner

  • BruceW
  • · Replies 12 ·
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12

Undergrad Calculating Nd:YAG Laser pulse energy

  • bakelas83
  • · Replies 5 ·
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5

Graduate Can Lasers Produce Matter Through 'Collisions'?

  • char20
  • · Replies 4 ·
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4

Undergrad Calc Power Output of 1 Square Meter Solar Panel on Earth

  • guss
  • · Replies 17 ·
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17

Undergrad Are solar cells more efficient for specific frequencies of light?

  • qazwsxedc
  • · Replies 1 ·
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1

Undergrad How Can Light Carry Energy Without Mass?

  • backtoearth
  • · Replies 3 ·
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3

Graduate Is There a Q Factor for DBRs?

  • Gen1111
  • · Replies 2 ·
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2

Graduate Can You Print Polarizing Filters on Glass or Plastic Substrates?

  • RogerInHawaii
  • · Replies 4 ·
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4

Graduate Lyapunov exponent - order of magnitude

  • dudy
  • · Replies 3 ·
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3

Graduate Barber's pole - appear faster than light?

  • kyle1320
  • · Replies 2 ·
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2

Graduate Determination of microlens focal length

  • milasiju
  • · Replies 4 ·
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4

Undergrad Can speed of light be changed ?

  • aby001234
  • · Replies 10 ·
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10

High School Can frequency of light be changed?

  • aby001234
  • · Replies 1 ·
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1

High School Is 'C' Faster Than the Speed of Light?

  • aby001234
  • · Replies 4 ·
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4

Graduate Shadow of light (Cardone et al)

  • my_wan
  • · Replies 1 ·
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1

Undergrad Measuring the Optical Power of a Pulsed Source

  • narra
  • · Replies 4 ·
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4

Graduate Do surface currents in a hollow metal waveguide radiate the reflected field?

  • fisico30
  • · Replies 1 ·
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1

High School Why Does Light Behave Differently Than Other Electromagnetic Waves?

  • aby001234
  • · Replies 4 ·
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4

Graduate Which Techniques Are Best for Optical Characterization of Semiconductors?

  • Maj_Tr
  • · Replies 2 ·
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2

Graduate How is it we know the speed of light?

  • whocouldshebe
  • · Replies 29 ·
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29

Undergrad Understanding Diffraction in a Double Slit Experiment

  • elabed haidar
  • · Replies 1 ·
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1

Undergrad Constructive Wave Interference: Can Two Waves Combine?

  • Bashyboy
  • · Replies 4 ·
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4

Undergrad Why don't frequency and period change when a wave refracts?

  • Bashyboy
  • · Replies 2 ·
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2

Undergrad Why is refractive index complex if the definition gives a real number?

  • misterwicked
  • · Replies 5 ·
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5

Graduate Kramer Kronigs applicable in what situations

  • singhvi
  • · Replies 7 ·
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7

Graduate Photon Sails in Interstellar Travel

  • MattRob
  • · Replies 6 ·
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6

Undergrad Particle size in polarizing filters

  • RogerInHawaii
  • · Replies 1 ·
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1

High School What happens when torchlight enters another light source?

  • newtwoophysic
  • · Replies 3 ·
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3

Graduate Circularly polarized light rotation rate

  • Clovis
  • · Replies 2 ·
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2

Undergrad Particle velocity components after reflecting off a triangle surface

  • Sidelines
  • · Replies 3 ·
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3

Graduate Modes of Propagation in an Optical Fibre

  • TwoHats
  • · Replies 3 ·
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3

Graduate Hypothetical situation of planck length object and lightspeed

  • Curtis15
  • · Replies 2 ·
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2

Graduate Dynamic light scattering => baseline

  • Martin Picard
  • · Replies 1 ·
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1

High School Does light speed up when it leaves water back to vacuum?

  • HyperUniverse
  • · Replies 7 ·
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7

Seeing Inside and Out: Fixing a Mistaken Mirror Placement

  • ilma232
  • · Replies 1 ·
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1

Undergrad Difference between Mie scattering and Rayleigh scattering

  • ZealScience
  • · Replies 13 ·
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13

Graduate Extreme Ultraviolet Wavelength Question

  • Polyverse
  • · Replies 4 ·
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4

Undergrad Can polarising filters sandwich in glass block light from all directions?

  • MIKEBROCK
  • · Replies 8 ·
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8

Graduate Why are clouds and water rapids white when bulk water is clear?

  • cragar
  • · Replies 23 ·
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23

Undergrad Velocity of light in water cloud

  • woody726
  • · Replies 1 ·
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1

Graduate Non-Coherent Light Diffraction through Double Slit

  • tapanther
  • · Replies 3 ·
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3