Optics Forum

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A Weird pattern for a laser beam spot
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I Single-slit diffraction experiment and the conservation of energy
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20
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2K
B The Redness of Red: fact or fiction?
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3
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589
Is classical Snell's law with a moving medium solvable?
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I Feynman's Vol 1 Lecture 26 Principle of Least Time (help with Figure)
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2
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623
I How to make the best collimator using a system of lenses?
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4
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909
Doppler Effect -- How fast would you need to go for a red light to appear green?
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17
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3K
I Simulating Star Images for Star Tracker Testing
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3
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747
I How Can One Derive the Diffraction Pattern Formula from a 1D Aperture?
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2
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993
How to know what m value to plug into thin film interference equations
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3
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8K
Why do rays of light from the Sun appear to be angled?
2
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49
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6K
I Compound Microscope System: Magnification Power Explained
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5
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I What is really happening in collimation of rays?
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7
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982
B How does polarisation in nature work?
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4
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763
I What Lens to Put In Front of an Complex Lens to Push Focal Plane Back?
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2
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816
B Why we use spherical mirrors instead of parabolic mirrors?
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18
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2K
Light Transmission Measurements: What Else Can You Find?
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15
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1K
In optics what do Tp and Ts stand for and what are they?
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3
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2K
Did Planck think the light emitted from black bodies to be quantised?
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9
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Mirror coating and BSDF measurement costs?
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1
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705
Earth's Rotation & Global Agriculture: Impact & Possibilities
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3
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944
Polar Ice Caps and the Earth's Speed of Rotation
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1
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691
Fluorescence of a laser vs its pulse duration
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1
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733
180 degree phase shift of reflected light
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2
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1K
Measuring the speed of light in a straight line
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19
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1K
Exploring the Possibilities of Sky Color
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7
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962
How to model light from a star?
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8
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727
Position of the principal points of a telephoto lens system
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3
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884
Connect: Coupling Light from 2 LEDs into a Single Fiber
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2
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2K
Can a continous wave laser be converted to a more powerful pulsed laser?
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23
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2K
Optics question: Looking at mirrors from parallel to the surface
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6
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878
How to estimate the interaction time of Raman scattering?
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1
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574
Crosstalk Algorithm - Optical system
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12
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913
Optics Equations - to reduce height
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5
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1K
Calculating distance between lux meter and light source
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2
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1K
Optical versus digital reflections
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13
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812
Mirrors spontaneously cracking
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8
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12K
Virtual and real image with concave mirror at 45 degrees
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4
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1K
RF transmitter inside a metal enclosure, re. reflections
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32
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2K
Interferometer delay & line light spreading
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2
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638
Mirror box with 1 candela of luminous intensity light source
3
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72
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4K
Power inside a microwave oven due to reflections
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15
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1K
What is it about ice that makes it so reflective?
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20
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3K
Critical angle (symmetry of refraction) confusion
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5
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2K
Using constructive interference of audio frequency waves to lower distortion
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3
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1K
ِAngular distribution of a scattered field
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2
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659
Double Glazed Window Reflection
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25
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5K
Rotation of the plane of polarization of light by glucose
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4
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1K
ABCD matrix formalism for concave mirror
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5
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2K
Question about whether UV light can penetrate a cardboard box
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22
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5K
Interference colors on a vinyl record
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26
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2K
Calculating the degree of polarization of reflecting light
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2
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1K
Achieving the speed of light at the end of a whip
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15
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3K
Basic question pertaining to Polar Coordinates & how to employ them
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2
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650
Lensmaker's equation when the 2 mediums on both sides of the lens are different
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1
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2K
Question on Optical Systems and Lenses
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1
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696
MCNPX , problem of detecting the photons in lattices
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1
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755
Is this a diffraction pattern?
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10
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1K
Does twisted light violate Fermat's principle?
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11
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1K
A way to make the standing-wave patterns in a microwave oven visible
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4
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1K
The sources of error in a diffraction grating experiment
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7
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5K
Spectrum of laser light absorbed and re-emitted by a white object
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7
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Classical explanation for microwave door shielding
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19
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2K
Instrument using two concave lenses
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3
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993
Does the ruby laser (the first invented laser) have nonlinear behavior?
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5
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1K
A heavier person vs. a lighter person diving into a pool
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6
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2K
Can heavy objects be used to modulate light waves with small amplitude?
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4
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797
What causes this curious light phenomenon? (video inside)
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11
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1K
Coupling of resonant modes in a 1D Photonic Crystal
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1
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1K
Why does the polarity of a bass guitar recording vary?
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10
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1K
Particle analysis of diffraction
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1
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522
How does a wave with circular polarization behave?
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9
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1K
Interference in thin films; confusion regarding geometry
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4
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676
Suspended particles and the index of refraction
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8
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936
How does the speed of light change when it enters glass?
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12
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2K
Can Light Travel Faster Than the Speed of Light in Glass?
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18
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1K
Is Light a Wave or a Particle?
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17
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22K
Circuits and the Speed of Light (2)
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2
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986
Circuits and the Speed of Light
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2
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678
How Does VIS-NIR Reflectance Linearity Vary in Mixed Color Pigments?
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4
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732
A living thing made of different photonic molecules?
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2
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867
Correction of horizontal astigmatism in an anamorphic lens
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1
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787
Deriving the Law of Reflection from Huygens Principle
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5
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1K
What is it that makes light rebound off a surface?
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1
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2K
Where do photons come from? Exploring the origin of photon emission in a vacuum
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17
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Can we see real, inverted and magnified images without a screen?
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4
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1K
Exploring Compton Scattering and Backscatter Scanners
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1
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815
Diffraction of light and conservation of energy.
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3
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1K
Negative Concave Lens - Creating a Beam Expander
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7
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Lens selection for close proximity surface photos
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11
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887
Adding Zooming Capability to my Far Infrared Spectrum Sensor
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12
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1K
How to calculate shadows in nanophotonics
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17
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1K
Polarisation through a chiral nematic crystal
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9
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913
Does a material change the direction of polarization of light?
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7
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1K
Question about two-stage light gas guns
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1
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728
Acoustic reflections from an elliptical wall in Urbino city (Italy)
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2
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807
Reflection of inverted waves to form a standing wave
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3
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1K
Differences between X-rays and Gamma rays
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3
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988
Can you calculate optical density from permittivity and permeability?
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19
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1K
Why does a divergent lens create an interference pattern?
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3
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1K

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