Optics Forum

Post thread

Threads

High School Storing light and using it to propel an object

  • J3J33J333
  • · Replies 10 ·
Replies
10

High School Infrared Cameras -- Do they use a Lens to Focus?

  • LightningInAJar
  • · Replies 10 ·
Replies
10

Undergrad Propagation of Angular Spectrum Code

  • stephen8686
  • · Replies 1 ·
Replies
1

High School Calculating the Angle Between Virtual Sources of Fresnel's Biprism

  • Shovon00000
  • · Replies 2 ·
Replies
2

High School Could a mirror in space let us photograph Earth's past?

  • atarah
  • · Replies 4 ·
Replies
4

Undergrad Why does scattered light appear polarized only at 90 degrees to the sun?

  • annamal
  • · Replies 7 ·
Replies
7

Undergrad Could the Sun burn an image sensor of a star tracker in space?

  • DhruvSorathiya
  • · Replies 3 ·
Replies
3

Undergrad Lux-meter, candelas or lux, measuring nits in practice

  • flying_bear
  • · Replies 2 ·
Replies
2

Undergrad Projector that beams video directly into the eyes

  • Arceus
  • · Replies 15 ·
Replies
15

High School Letter reflection from beer can

  • nmsurobert
  • · Replies 16 ·
Replies
16

Undergrad How Does Rotating Polarization Work in Optics Experiments?

  • ynyin
  • · Replies 5 ·
Replies
5

Undergrad Russia Claims Laser Weapon Can Destroy Drones: Is it Possible?

  • peetm
  • · Replies 2 ·
Replies
2

Graduate Diffraction of spherical wave by plane grating

  • Philip Koeck
  • · Replies 1 ·
Replies
1

Graduate Thought experiments suggest problem with published work

  • Gezstarski
  • · Replies 8 ·
Replies
8

High School Intuitive, conceptual understanding of holography

  • BiGyElLoWhAt
  • · Replies 3 ·
Replies
3

Undergrad Calculating Candela Power for LED

  • fsonnichsen
  • · Replies 8 ·
Replies
8

Undergrad Polarizing filter synthesis and dynamics

  • mohamed_a
  • · Replies 4 ·
Replies
4

High School Can you trap light indefinitely?

  • ArcanaNoir
  • · Replies 37 ·
2
Replies
37

Undergrad Find the interference function for different emission modes

  • DragonBlight
  • · Replies 2 ·
Replies
2

High School A variation on the Fresnel Spot experiment

  • Bernadette
  • · Replies 36 ·
2
Replies
36

High School Is Infrared Light Invisible to Humans Due to Eye Limitations?

  • gehrenfeld
  • · Replies 3 ·
Replies
3

High School Number of fringes in a 2-slit diffraction pattern

  • nmsurobert
  • · Replies 6 ·
Replies
6

High School Why does the Sun seem so bright?

  • thetexan
  • · Replies 5 ·
Replies
5

Undergrad Collimating a laser beam with a fixed focal point?

  • SirLollington
  • · Replies 9 ·
Replies
9

Undergrad Are there any inexpensive spectrometers?

  • LightningInAJar
  • · Replies 18 ·
Replies
18

Undergrad Interference - two waves of different frequencies - beat velocity

  • LmdL
  • · Replies 4 ·
Replies
4

Undergrad What does a "phase reversal" really do?

  • cmlee1324
  • · Replies 3 ·
Replies
3

Undergrad Reflectivity of pure metals in vacuum vs oxidized metals

  • jms4
  • · Replies 1 ·
Replies
1

Undergrad Finding focal length of the lens using "u-v" method

  • VVS2000
  • · Replies 8 ·
Replies
8

Undergrad Experimental demonstration of an absorption spectrum

  • DDesulgon
  • · Replies 7 ·
Replies
7

Undergrad What does "upright" mean in geometric optics?

  • samy4408
  • · Replies 2 ·
Replies
2

Graduate Structural coloration of a zeolite monolayer

  • Dyn Doeth
  • · Replies 7 ·
Replies
7

High School How Can You Safely Observe Bright Light Sources with a DIY Spectroscope?

  • DDesulgon
  • · Replies 3 ·
Replies
3

Undergrad Collimating diverging light from a fiber optic cable for fluorescence

  • EBINESH
  • · Replies 1 ·
Replies
1

Graduate Exposure methods used in photolithography

  • Hananism
  • · Replies 4 ·
Replies
4

Undergrad Where do overlap integrals come from mathematically?

  • Ahmed123
  • · Replies 3 ·
Replies
3

Graduate Extracting Color from a Spectral Date

  • VitorsSantiago
  • · Replies 10 ·
Replies
10

Undergrad Is there any smart material that gets lighter/heavier?

  • WakaShocka
  • · Replies 10 ·
Replies
10

Graduate Find the Best Zemax Textbook for Professional Optical Engineers

  • laclry311
  • · Replies 2 ·
Replies
2

High School Fermat's principle and refraction -- Possible misunderstanding

  • lemma28
  • · Replies 42 ·
2
Replies
42

Graduate Phase lag of light in materials

  • hacivat
  • · Replies 8 ·
Replies
8

Undergrad Does Light Have a Measurable Density?

  • Niflheim
  • · Replies 52 ·
2
Replies
52

Undergrad Refractive index vs Temperature

  • jaumzaum
  • · Replies 2 ·
Replies
2

High School Is light breaking its own speed limit when cornering?

  • Dum Leme
  • · Replies 25 ·
Replies
25

High School Why does light diffract into only seven colours?

  • louis_slicka
  • · Replies 81 ·
3
Replies
81

Undergrad Collimating a fibre-coupled LED light source

  • Gifty01
  • · Replies 1 ·
Replies
1

Undergrad On 'A Quarter Waveplate (QWP) rotated between 2 Polarisers'

  • warhammer
  • · Replies 5 ·
Replies
5

Graduate How is phase velocity related to deflection angle?

  • binis
  • · Replies 19 ·
Replies
19

Undergrad Do parabolic mirrors need polishing to reflect infrared effectively?

  • cj
  • · Replies 3 ·
Replies
3

Undergrad How does the double-slit pattern change depending on the slits?

  • Ad VanderVen
  • · Replies 30 ·
2
Replies
30

High School Wavelength of a laser beam emerging from a prism

  • Andrew Wright
  • · Replies 1 ·
Replies
1

Undergrad Does light passed through two window screens get polarized?

  • Bob8102
  • · Replies 8 ·
Replies
8

Undergrad Curious formula for elliptical polarisation

  • DrDu
  • · Replies 2 ·
Replies
2

Graduate What is the physical dimension of transduction coefficient in photonics?

  • jojoe
  • · Replies 2 ·
Replies
2

Graduate Reflectance with gradual refractive index change from 1 to 3

  • thepolishman
  • · Replies 6 ·
Replies
6

Graduate Does reflection happen instantly at the atomic level?

  • Aaronazi
  • · Replies 8 ·
Replies
8

Undergrad Why don't secondary wavefronts contribute to single slit diffraction?

  • amjad-sh
  • · Replies 17 ·
Replies
17

Undergrad How do lens formulas explain plano-convex and plano-concave aberration?

  • VVS2000
  • · Replies 7 ·
Replies
7

Undergrad Why does light travel slower in water?

  • student34
  • · Replies 31 ·
2
Replies
31

Graduate Energy problem of light interference

  • liuxinhua
  • · Replies 7 ·
Replies
7

Undergrad Could a Gaussian beam be described as parallel at a large distance?

  • Haorong Wu
  • · Replies 3 ·
Replies
3

Undergrad Interference and conservation of energy in a resonator

  • JerryY
  • · Replies 28 ·
Replies
28

Undergrad Spherical aberration in Biconvex and Plano Convex lenses

  • VVS2000
  • · Replies 2 ·
Replies
2

Graduate Data storage using microtubules?

  • debdrite235
  • · Replies 2 ·
Replies
2

High School Why do reflections in water sometimes appear different from what we see?

  • kuruman
  • · Replies 15 ·
Replies
15

Undergrad Do rainbows and holograms share the same diffraction principles?

  • skynelson
  • · Replies 33 ·
2
Replies
33

Undergrad Why is the reflected sunset redder than the direct sunset?

  • wilddouglascounty
  • · Replies 1 ·
Replies
1

High School Is there a material that allows visible light and UV light to pass through?

  • Furno
  • · Replies 12 ·
Replies
12

Undergrad Does incoherent light produce interference patterns on a CD?

  • MaxLinus
  • · Replies 2 ·
Replies
2

Undergrad How to "think" of a polarizer in matrix representation?

  • fluidistic
  • · Replies 3 ·
Replies
3

Undergrad Correct Formula for "No Fringe Condition" (Michelson Interferometer)

  • warhammer
  • · Replies 2 ·
Replies
2

Undergrad Fresnel equations and conservation of energy (phase shifts)

  • JerryY
  • · Replies 8 ·
Replies
8

Undergrad Umbrella fabric and diffraction pattern

  • Orthoceras
  • · Replies 2 ·
Replies
2

Undergrad Shorten the lens distance while having same focal length?

  • Horizont22
  • · Replies 13 ·
Replies
13

Undergrad Using Diffraction (i.e., Fresnel Zone Plate) to defocus/diverge light

  • jgk5141
  • · Replies 2 ·
Replies
2

Undergrad Double slit fringe visibility with sunlight

  • Heidi
  • · Replies 6 ·
Replies
6

High School How far do photons travel inside common lasers?

  • jg167
  • · Replies 6 ·
Replies
6

Graduate Magnifying diffraction patterns and real images

  • Philip Koeck
  • · Replies 13 ·
Replies
13

Graduate Optimum profile of light pipe exit for narrow beam angle

  • Redron
  • · Replies 16 ·
Replies
16

Undergrad How Do Electromagnetic Lenses Magnify the Image?

  • Dario56
  • · Replies 10 ·
Replies
10

Graduate Imperfectly Phase-Modulated Light / Residual Amplitude Modulation

  • Twigg
  • · Replies 2 ·
Replies
2

Graduate Weird pattern for a laser beam spot

  • Malamala
  • · Replies 9 ·
Replies
9

Undergrad Single-slit diffraction experiment and the conservation of energy

  • amjad-sh
  • · Replies 20 ·
Replies
20

High School Light propagation in dense media

  • jeremyfiennes
  • · Replies 21 ·
Replies
21

High School Speed of light versus wavelength

  • louis_slicka
  • · Replies 14 ·
Replies
14

Undergrad Defining color scientifically with additive mixing equations and luminosity

  • pastelchu
  • · Replies 23 ·
Replies
23

High School Does this experiment prove that light speed is actually faster?

  • Rev. Cheeseman
  • · Replies 4 ·
Replies
4

High School The Redness of Red: fact or fiction?

  • Dr Wu
  • · Replies 3 ·
Replies
3

Graduate Is classical Snell's law with a moving medium solvable?

  • jk22
  • · Replies 9 ·
Replies
9

Undergrad Equal angles in Feynman Lecture 26 Figure 26-4 geometry

  • Sparky_
  • · Replies 2 ·
Replies
2

Undergrad How to make the best collimator using a system of lenses?

  • DhruvSorathiyaPhysic
  • · Replies 4 ·
Replies
4

High School Why does the combined field move slower in the Fermilab light in water explanation?

  • jeremyfiennes
  • · Replies 11 ·
Replies
11

High School Newton's Rings central spot brightness

  • versine
  • · Replies 5 ·
Replies
5

Undergrad Doppler Effect -- How fast would you need to go for a red light to appear green?

  • Parker Hame
  • · Replies 17 ·
Replies
17

Undergrad Simulating Star Images for Star Tracker Testing

  • DhruvSorathiya
  • · Replies 3 ·
Replies
3

Undergrad Optical proprieties of sulfur dioxide in the gaseous state

  • solar energy
  • · Replies 6 ·
Replies
6

Graduate What do the subscripts mean in LIF spectrum branches?

  • Favry2021
  • · Replies 22 ·
Replies
22

Undergrad How Can One Derive the Diffraction Pattern Formula from a 1D Aperture?

  • struggling_student
  • · Replies 2 ·
Replies
2

Undergrad Does reflected sunlight have higher luminous efficacy than direct sunlight?

  • n124122
  • · Replies 4 ·
Replies
4

Undergrad How to know what m value to plug into thin film interference equations

  • carrotcake123
  • · Replies 3 ·
Replies
3