Optics Forum

Post thread

Threads

Undergrad Why is Biasing Important for Photodetectors?

  • eahaidar
  • · Replies 4 ·
Replies
4

Undergrad The Mirror Question: What Changes in Physics?

  • mesaphlin
  • · Replies 4 ·
Replies
4

High School Projecting an image onto a mirror

  • jjddd
  • · Replies 7 ·
Replies
7

Graduate Gravitational Lensing: No Distortion of Sun Images Around Black Hole

  • smrek
  • · Replies 1 ·
Replies
1

Undergrad Best lens for collecting light at the focal point of a parabolic reflector

  • Karnifax
  • · Replies 24 ·
Replies
24

Undergrad How to make laser energy consistent?

  • jjoll
  • · Replies 2 ·
Replies
2

Undergrad Laser to determine effect of sucrose concentration on refractive index

  • barca12345
  • · Replies 2 ·
Replies
2

Undergrad The Double Slit Experiment and the amplitude of light

  • CapsE
  • · Replies 19 ·
Replies
19

High School Can a Magnifying Glass and Prism Create an Ignitable Rainbow?

  • Graze
  • · Replies 1 ·
Replies
1

Undergrad Reflection coefficient for conductor covered with dielectric layer

  • ShayanJ
  • · Replies 9 ·
Replies
9

Graduate Light released within a sphere with a perfectly opaque inner surface

  • antwan89
  • · Replies 4 ·
Replies
4

High School Why does a light blinking quickly average out as 'on' to us?

  • Steve Drake
  • · Replies 11 ·
Replies
11

Undergrad Does White Light Really Exist as One Wave?

  • Fiona Rozario
  • · Replies 1 ·
Replies
1

High School Light -- why does it bend/refract?

  • NUCLIDES
  • · Replies 8 ·
Replies
8

Graduate Speed of light in unusual materials

  • skate_nerd
  • · Replies 15 ·
Replies
15

Undergrad What Causes Cloud-to-Ground Lightning Instead of Intra-Cloud Discharge?

  • Somnolence
  • · Replies 4 ·
Replies
4

Graduate What is the meaning of the delta in Fermat's principle integral?

  • manimaran1605
  • · Replies 2 ·
Replies
2

High School Tracing a laser pointer with IR camera

  • MarcGyongyosi
  • · Replies 3 ·
Replies
3

High School Light converging inside the eye

  • ViolentCorpse
  • · Replies 27 ·
Replies
27

Undergrad Width of a wire grid polarizer

  • deep838
  • · Replies 3 ·
Replies
3

Undergrad The Difference in Refraction Angles of Different Colored Light

  • HeavyMetal
  • · Replies 11 ·
Replies
11

Undergrad Snell's law relating angles and refractive indices

  • Greg Bernhardt
  • · Replies 1 ·
Replies
1

Graduate Single slit diffraction equations for Fraunhofer pattern

  • Greg Bernhardt
  • · Replies 1 ·
Replies
1

Graduate What are Nonlinear Optics - 2nd Order Processes

  • Greg Bernhardt
  • · Replies 1 ·
Replies
1

Graduate How Does Nonlinear Optics Impact Light Propagation in Media?

  • Greg Bernhardt
  • · Replies 1 ·
Replies
1

Undergrad Gaussian lens equation and thin lens formula

  • Greg Bernhardt
  • · Replies 1 ·
Replies
1

Undergrad Definition of Intensity of Radiation

  • Greg Bernhardt
  • · Replies 1 ·
Replies
1

Undergrad The meter, the second, and the speed of light

  • Kyle5555
  • · Replies 11 ·
Replies
11

Graduate Understanding Gaussian Beams: Definition, Equations, and Parameters

  • Greg Bernhardt
  • · Replies 1 ·
Replies
1

Undergrad Diffraction: definition, examples, and near/far field patterns

  • Greg Bernhardt
  • · Replies 1 ·
Replies
1

Graduate What is the Double Slit? A 5 Minute Introduction

  • Greg Bernhardt
  • · Replies 0 ·
Replies
0

Graduate How Does a Circular Aperture Affect Light Diffraction?

  • Greg Bernhardt
  • · Replies 1 ·
Replies
1

High School Why Does Laser Light Bend in a Spring?

  • Oomph!
  • · Replies 3 ·
Replies
3

Graduate Why Is the Denominator in Fermat's Principle (c/n) Instead of (cn)?

  • manimaran1605
  • · Replies 1 ·
Replies
1

Undergrad Can software make smartphone display appear at optical infinity?

  • leonid.ge
  • · Replies 7 ·
Replies
7

Undergrad What is the maximum switching speed for electromagnet polarity?

  • Slakjak1215
  • · Replies 6 ·
Replies
6

Graduate What is the working principle of wire grid polarizers?

  • allister
  • · Replies 1 ·
Replies
1

Optic microscopes. New illumination technic

  • ramonpujals
  • · Replies 7 ·
Replies
7

Graduate What Does Plane Wave of Infinite Extent Mean in Optics?

  • manimaran1605
  • · Replies 2 ·
Replies
2

Undergrad Does light change color when entering a denser medium?

  • wellorderingp
  • · Replies 19 ·
Replies
19

Undergrad Intensity and frequence of light

  • yashpurohit
  • · Replies 4 ·
Replies
4

Graduate Making a 50 um collimated beam on a budget

  • Mike_In_Plano
  • · Replies 5 ·
Replies
5

Undergrad Difference between propagation number K and wave number k in Hecht's Optics

  • manimaran1605
  • · Replies 4 ·
Replies
4

Undergrad AM radio demodulation in unshielded speakers from nearby transmitters

  • ChromeBit
  • · Replies 2 ·
Replies
2

Graduate Laser Beam - Divergence and Solid Angle

  • Naz93
  • · Replies 13 ·
Replies
13

Graduate Ultraviolette Catastrophy -Intensity causes melting of objects?

  • christian0710
  • · Replies 2 ·
Replies
2

Graduate Soft X-Rays: Causes & Energy Rates

  • Entanglement
  • · Replies 15 ·
Replies
15

Undergrad Ray diagrams, lenses and microscopes

  • u0362565
  • · Replies 2 ·
Replies
2

Graduate Correlation operation as measure of similarity between two functions

  • HJ Farnsworth
  • · Replies 2 ·
Replies
2

Undergrad Why do clouds cast shadows in space?

  • Ayesha_Sadiq
  • · Replies 7 ·
Replies
7

Graduate Optical tweezers for manipulating atoms together to form new structure

  • steve31
  • · Replies 2 ·
Replies
2

High School Why does 'white light' from the Sun look yellow?

  • Ayesha_Sadiq
  • · Replies 11 ·
Replies
11

Graduate Oscillating E Field Interpretation of Light

  • jaydnul
  • · Replies 8 ·
Replies
8

Graduate Divergence angle of light exiting a nano-etched single mode fiber

  • melnop
  • · Replies 1 ·
Replies
1

Graduate Polarizability of uniform electron cloud around nucleus

  • iScience
  • · Replies 1 ·
Replies
1

Graduate Inverse Problems in Scattering

  • Steve Drake
  • · Replies 3 ·
Replies
3

Undergrad Oversampling and phase retrieval in Fraunhofer diffraction

  • wybmax
  • · Replies 4 ·
Replies
4

Graduate Poynting vector and intensity in scalar diffraction theory

  • ashita
  • · Replies 2 ·
Replies
2

Graduate Phase shift formula in stimulated Brillouin scattering

  • eahaidar
  • · Replies 4 ·
Replies
4

Graduate Relationship between radiant intensity and radiance in a simplified 2D model

  • spacediver
  • · Replies 13 ·
Replies
13

Undergrad Why Does Microwaving a Grape Produce Plasma?

  • Oomph!
  • · Replies 2 ·
Replies
2

Graduate Mechanistic analysis of lambertian and isotropic radiators

  • Centrefuge
  • · Replies 1 ·
Replies
1

Undergrad Why Does a Fresnel Lens Create an Upright Image in a Galilean Telescope Setup?

  • soomro
  • · Replies 3 ·
Replies
3

Undergrad Why is cold gas used for producing an absorption line spectrum?

  • Entanglement
  • · Replies 20 ·
Replies
20

Graduate Proof of Fermat and Huygens–Fresnel principle

  • Nick Jackson
  • · Replies 1 ·
Replies
1

Graduate Lasers: Power and wavelength dependence

  • MelioraGator
  • · Replies 2 ·
Replies
2

Graduate How do electric and magnetic fields propagate in an electromagnetic wave?

  • Wittyname6
  • · Replies 15 ·
Replies
15

Graduate Lens to lens distance is not 2f in "4f system"

  • lioiviei14
  • · Replies 1 ·
Replies
1

High School A Descriptive Explanation of Photons required

  • Aditya Vishwak
  • · Replies 9 ·
Replies
9

Graduate A square looks at light squared

  • tbco
  • · Replies 12 ·
Replies
12

High School Light Absorption and Transmission

  • mangoplant
  • · Replies 4 ·
Replies
4

Graduate What is the direction of the anode heel effect in a rotating anode x-ray tube?

  • avihs80
  • · Replies 1 ·
Replies
1

Graduate How to define the plane of incidence for normal incidence

  • fannyfanfanz
  • · Replies 1 ·
Replies
1

Graduate Is the Speed of Light Changing? Implications for Permittivity and Permeability.

  • iScience
  • · Replies 6 ·
Replies
6

Undergrad Why do manufacturers use a gas that emits UV light in fluorescent light bulbs?

  • dEdt
  • · Replies 9 ·
Replies
9

Graduate Relation between Hamiltonian of light ray and that of mechanics

  • genxium
  • · Replies 4 ·
Replies
4

Graduate Resources for learning order of magnitude estimation techniques

  • "pi"mp
  • · Replies 5 ·
Replies
5

High School Why does an object look smaller in a mirror when placed further away?

  • Alex Jong
  • · Replies 3 ·
Replies
3

Graduate Can a thick pinhole create a spot smaller than the diffraction limit?

  • Athiril
  • · Replies 1 ·
Replies
1

Undergrad Understanding single slit interference

  • XanziBar
  • · Replies 4 ·
Replies
4

High School Lenses question -- Can lenses Magnify?

  • ted.hb
  • · Replies 2 ·
Replies
2

Graduate How Can I Mathematically Represent the Polarization of a Laser Beam?

  • Asierro
  • · Replies 1 ·
Replies
1

High School Why does the thunder from lighting last much longer than the flash?

  • cantgetaname
  • · Replies 2 ·
Replies
2

Undergrad Calculate the intensity of a solid object made up of point light sources?

  • ericwithakay
  • · Replies 1 ·
Replies
1

Undergrad Metal spray coating visible in X-rays for object coating

  • Sylvester1
  • · Replies 10 ·
Replies
10

High School Why don't mirrors invert the image vertically?

  • interhacker
  • · Replies 10 ·
Replies
10

Undergrad Characteristics of beam splitters

  • naima
  • · Replies 3 ·
Replies
3

Undergrad Focal Length of a Plano Convex Lens

  • bgq
  • · Replies 2 ·
Replies
2

Graduate Light Plane Photography - Is my explanation correct?

  • jktales
  • · Replies 14 ·
Replies
14

Graduate Calculating Air Extinction Coefficient at 275 nm Wavelength

  • ykaravas
  • · Replies 1 ·
Replies
1

Graduate Clockwise rotation of reflection coefficient in lossy LTI systems

  • WhiteHaired
  • · Replies 4 ·
Replies
4

High School Mediums that only refract light

  • ghostfolk
  • · Replies 4 ·
Replies
4

Undergrad What would an object look like if it reflected no light?

  • DomPhillips
  • · Replies 5 ·
Replies
5

High School How can I see something that has no mass ?

  • ArtsDegreeGuy
  • · Replies 21 ·
Replies
21

Undergrad Spectral response and selectivity

  • shpongle
  • · Replies 1 ·
Replies
1

High School Second focal point of a concave lens

  • Fiona Rozario
  • · Replies 2 ·
Replies
2

Undergrad Why Does a Convex Lens Create a Flower-Like Light Pattern?

  • swaroop
  • · Replies 7 ·
Replies
7

Undergrad Insulating box in a lightning storm

  • dEdt
  • · Replies 13 ·
Replies
13

Graduate Photon Direction: What Determines the Emission?

  • XanziBar
  • · Replies 1 ·
Replies
1

Graduate How do laser interferometers measure distances greater than 1wavelengt

  • blin1994
  • · Replies 2 ·
Replies
2