lensfocus
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Lenses and Pinholes: What Does "In Focus" Mean?

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In introductory physics, the optics unit often teaches about…
sabine1

Interview with a Theoretical Physicist: Sabine Hossenfelder

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We are pleased to introduce Sabine Hossenfelder. Sabine is a…
deriitive5
,

The Pantheon of Derivatives - Part V

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  Important Theorems - biased, of course Implicit…
RelativityVariables
,

Relativity Variables: Velocity, Doppler-Bondi k, and Rapidity

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Traditional presentations of special relativity place emphasis…
deriitive4
,

The Pantheon of Derivatives - Part IV

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  Lie Derivatives A Lie derivative is in general the…
deriitive3
,

The Pantheon of Derivatives - Part III

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  Some Topology Whereas the terminology of vector…
cameralense
,

New High Performance Ultra-wide Angle Lenses

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Note, unless otherwise specified, all focal lengths are in terms…
deriitive2
,

The Pantheon of Derivatives - Part II

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  Generalizations Beyond ##\mathbb{R}## and ##\mathbb{C}## As…
deriitive
,

The Pantheon of Derivatives - 5 Part Series

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  Differentiation in a Nutshell I want to gather the…
diffractiontheory
,

The Diffraction Limited Spot Size with Perfect Focusing

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Purpose:  The purpose of this Insights article is to give…
learned
,

What Is The Most Important Thing That You Learned?

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I mentioned in an earlier Insight on what I think are the most…
integraltrick
,

Trick to Solving Integrals Involving Tangent and Secant

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This little trick is used for some integration problems involving…
math

Interview with Mathematician Fresh_42

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We are please to introduce our newest member of the mentor group,…
linearacceleration
,

Frames of Reference: Linear Acceleration View

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My previous Insight, Frames of Reference: A Skateboarder's View,…
scavengerhunt2

PF Insight Scavenger Hunt 2

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We have an amazing count of over 320 Insights published at Physics…
computerlanguages
,

Computer Language Primer - Part 1

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In this Insights Guide the focus is entirely on types of languages,…
cornuspiral
,

Frenet Equations in 2-D Which Result in the Cornu Spiral

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This Insights article is intended as an introduction to the Frenet-Serret…
experimenthistory
,

History's First Science Experiments

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In this Insight I'm going to talk about two of the first science…
boatramps
,

Real Research in Unexpected Places - Boat Ramps

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Read part 1 -Backyards, Barns, Bayous Real Research in Unexpected…
geometrysimple
,

Simple Geometry, Deep Math

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Introduction It is a remarkable fact that consideration of…
quantumflux
,

Vacuum Fluctuations in Experimental Practice

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This Insight Article is a sequel of the Insight Articles ”The…
magnet
,

Permanent Magnets Explained by Magnetic Surface Currents

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Introduction: The purpose of this Insight is to explain permanent…
nasa

Test Your NASA Knowledge

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Since the mid 20th century NASA has been a force in aerospace…
jimhardy

Interview with Instrument Engineer Jim Hardy

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Give us a little background on Jim Hardy Born and raised in…
highercategorytheory
,

Why Higher Category Theory in Physics?

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  This here is my personal story. For an alternative…
steven

Interview with Physics Mentor: Stevendaryl

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Give us a brief history on stevendaryl I was born and raised…
inferometer
,

Fabry-Perot and Michelson Interferometry: A Fundamental Approach

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Fabry-Perot Effect: The Fabry-Perot effect is usually treated…
FourierSeries
,

Using the Fourier Series To Find Some Interesting Sums

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Preliminaries If f(x) is periodic with period 2p and f’(x)…
SchwarzschildGeometry4
,

The Schwarzschild Geometry: Part 4

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  In the last article, we looked at various counterintuitive…
SchwarzschildGeometry3
,

The Schwarzschild Geometry: Part 3

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  When we left off in part 2, we were looking at…
SchwarzschildGeometry2
,

The Schwarzschild Geometry: Part 2

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  At the end of part 1, we looked at the form the…
fakenews
,

Fake News and Science Reporting

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During and even after the recent US election campaign, there…
SchwarzschildGeometry1
,

The Schwarzschild Geometry: Part 1

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  Not long after Einstein published his Field Equation,…