Optics Forum

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Light & Black Holes: Can Massless Light be Sucked?
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Calculating Photon Count from Xenon-Arc Lamp
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1
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4K
Light can't travel at the speed of light?
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47
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Do photons really bounce and bend? A question for physicists
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4
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Optics, reflexion over water: why?
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7
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Can We Turn the Universe Into Photons?
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2
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Why can't someone who is myopic see reflections clearly?
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3
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Spectroscopy via diffraction gratings with different spacings
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2
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Thickness of lens and its focal length
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1
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Is Light a Wave or Something More?
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8
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Changing Visible Light into IR and then back
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1
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3K
Can X-Ray Ionisation Affect Non-Metals and Gases?
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7
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Light and Sound Waves: Can You See Through Walls?
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20
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What determines how light is reflected
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3
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About polar vectors and pseudo vectors
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10
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Speed Of Light and Gravitational Force
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4
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3K
Can the light from a rotating bike wheel bend outside of the column?
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10
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What is the difference between diffraction and refraction in waves?
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15
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Negative Light Speed: Explaining the Physical Meaning of -c
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3
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Question about the brightness of light and the inverse square law.
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2
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How to know phase difference will be of a light wave entering a thin film?
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1
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Why are light waves from 2 separate light bulbs incoherent?
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5
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6K
Helium 4 & Photon: Seeping & Propagation
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4
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Understanding X-ray Attenuation: Determining Absorption Probability and Depth
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2
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3K
Question about light speed and something I'm having trouble understanding
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8
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I want to know that light has mass or not.
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23
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Can we 'feel' magnitudes of distant forces?
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1
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What Happens to the Energy in Destructive Wave Interference?
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39
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14K
What Software Can Simulate Light Reflection for a Solar Heliostat Project?
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1
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Gas Laser: Stimulated Emission and Positive Ions
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Magnitude of acceleration on a ramp
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13
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Shape of Light: Uncovering the Mystery
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37
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What Is Photonics and How Does It Involve Manipulating Photons?
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1
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The Speed of Light: Physics and Possibilities
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4
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How do Photons Reach the Speed of Light?
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39
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11K
Is Solar Sail Propulsion Feasible with Photonic Laser Thrusters?
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22
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Reading a book in the infrared
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3
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How do I generate a diffraction pattern using FFT from a single slit?
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5
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10K
Do Photons Have Mass or Just Influence from Gravity?
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8
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Light travel at different speeds in different medium
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1
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Chromatic Dispersion, and Variability of Refractive Index on Wavelength
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5
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5K
What would be the force on a beam of particles from focused sunlight?
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15
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Diffraction of a circular aperture
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2
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Understanding Fourier Optics: From Spatial to Temporal Transformations
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5
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How Does Lens Shape Affect Focal Lengths?
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1
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Why is Light in a Sine Wave Form?
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23
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27K
Understanding Thin Lens Formula: Image Location & Projection
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1
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How Many Lumens Are Needed to See a Flashing LED at 500 Meters?
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6
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Index of Refraction Chart: Find Many Materials & Values
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2
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Photonics Resources for Undergraduate Students
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2
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Understanding How X-Rays Work: Explained by an Expert
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19
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Magnitude and Attenuation in Fields subject
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6
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Why Is Putting Metal in a Microwave Dangerous?
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15
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52K
S11 (scattering parameter 11) of a Resonator?
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2
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RealD Glasses and the polarized effect.
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2
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Compton Scattering Using Newtonian Physics
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3
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Energy <-> Mass conversion and visible light
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7
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Photons and gravitational field
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2
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Is it possible to make a gravity mirror ?
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1
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8K
Negative Focal Length and Convex Mirrors: Is 1/di Negative?
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1
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What is the difference between mixed light and pure light?
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2
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3K
Magnifying Glass & UV Rays - Is Cooking Possible?
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2
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Help needed: coupling light from a LED into an optical fiber
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1
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7K
Pyro Optical Pyrometer by The Pyrometer Instrument Co. - Model/Type?
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1
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Red shift photons: where does the energy come from?
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2
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Is a bullet at the speed of light lethal?
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7
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What is the formula for magnitude and what exactly is it?
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2
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Is it possible to make a closed mirror system?
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11
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4K
Why aren't interference filters also polarizers?
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3
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How does a laser beam propel objects in air?
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6
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Light velocity change in different medium
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Does a light pulse get amplified when it goes to a less dense medium?
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5
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Light Reflection: Can Sunlight Take Craft Back to Launch?
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7
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Ideal destructive interference of two beams - Where is the energy?
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9
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Propagation of light in a vaccuum?
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27
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Sunglasses which reflects like a mirror
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3
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Photonic Crystal Fibres and COMSOL
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3
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Uncovering the Mystery of Bullet Flight: Investigating the Helix Theory
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5
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Travelling at the speed of light
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9
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Why Does an Object Appear Blue When All Other Frequencies are Absorbed?
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6
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What is the relationship between coherence and interference in wave propagation?
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13
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Do heavy and light cylinders roll the same?
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3
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Can Laser Technology Outpace Radio Signals for Information Transmission?
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11
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Does Light Have Zero Length and What Does That Mean for Velocity?
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18
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What do they mean by Light being a wave?
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24
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Laser optical components/setup
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6
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Interference of Light: Where Does the Energy Go?
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15
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Capturing light photons with the Hubble
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3
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Energy apparently equals mass times the speed of light squared
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32
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Optics: Ray matrix for a thin lens
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11
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Understanding How Infrared Thermometers Work
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8
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3K
Calculating Impact Force of Freefalling Objects in Fenestration Testing
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5
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Uncertainty principle - light beam
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2
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Light some interesting questions and an observation
2
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61
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15K
Black holes, speed of light and gravity oh my
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15
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4K
180 degree out of phase reflection?
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8
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9K
Have you ever wondered about the physics behind the diffraction of moonlight?
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3
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3K
Fraunhoffer Diffraction
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4
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Light Propagation: Electric & Magnetic Fields in Vacuum/Medium
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6
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Travel Faster than a Photon: My 1st Forum Q
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34
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5K

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