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Page 6 of 13 — articles on the physics of light, sorted newest first.
Diffraction vs Interference: 5 Easy Key Differences
Diffraction is the spreading of waves around obstacles or through openings. Interference is the superposition of waves from two or more sources. The simplest way to tell them apart: diffraction involves one wavefront bending around an edge, while interference requires at least two wavefronts overlapping. They produce different fringe patterns — diffraction fringes are unevenly spaced with rapidly decreasing intensity, while interference fringes are evenly spaced with near-constant intensity. This guide compares both phenomena side by side.
Destructive Interference Formula: 5 Essential Wave Equations
The destructive interference formula is Δr = (n + ½)λ (path difference equals a half-integer number of wavelengths). The constructive interference formula is Δr = nλ (path difference equals a whole number of wavelengths). Which formula you use depends on what you know — path difference, phase difference, or the experimental setup. This guide compiles all five essential interference formulas in one place, with two worked examples showing exactly how to apply them.
Constructive vs Destructive Interference: 5 Easy Comparisons
The short answer: constructive interference happens when wave crests align and reinforce each other (louder, brighter, bigger amplitude). Destructive interference happens when a crest meets a trough and they cancel each other out (quieter, darker, smaller amplitude). Which one you get depends entirely on the phase or path difference between the waves. This guide walks through the definitions, formulas, comparison table, and real-world uses of both types.
What Is Optical Fiber? 5 Simple Facts on How It Works
Optical fiber is a hair-thin strand of glass that carries data as pulses of light. This pillar guide covers what optical fiber is, how it works through total internal reflection, the difference between single-mode and multi-mode, and why fibre optics are the backbone of modern communication.
What Is Fiber Optic Internet? 7 Key Facts Worth Knowing
Fiber optic internet is a broadband connection that uses pulses of light through glass fiber cables to deliver data. Unlike cable or DSL, it offers symmetrical multi-gigabit speeds, lower latency, and greater reliability. This guide explains how it works, how it compares to other internet types, and when it's worth the switch.
What Is Fiber Optic Cable Made Of? 6 Simple Materials
A fibre optic cable is made of five key layers: the glass core (ultra-pure silica), cladding (lower-index glass), buffer coating (acrylate polymer), strength members (aramid yarn/Kevlar), and outer jacket (PVC or LSZH). This guide covers what each part does and the materials used.
What Does Fiber Optic Cable Look Like? 6 Clear Visual Facts
A fiber optic cable looks like a slim plastic cord from the outside — similar to an HDMI or coaxial cable but thinner. Inside, it is a hair-thin strand of solid silica glass wrapped in protective layers. The jacket colour tells you the type: yellow for single-mode, orange or aqua for multimode.
What Are Fiber Optic Cables Used For? 11 Surprising Uses
Fiber optic cables are used for far more than the internet. From medical endoscopy and submarine data cables to military drones and decorative lighting, this guide covers 11 real-world applications with the physics behind each.
Fiber Optic Cable Types: 7 Key Single-Mode vs Multimode
There are 7 standard types of fibre optic cable: 2 single-mode (OS1, OS2) and 5 multimode (OM1 through OM5). This guide covers each type's core diameter, bandwidth, distance, jacket colour, and which one you actually need for your installation.
Optical Fibre Invention: 6 Key Facts & History
The optical fibre invention was not a single moment: it took over a century of work. This guide covers 6 key milestones — from Colladon's 1842 light-fountain to Kao's Nobel-winning 1966 prediction — and the scientists who made fibre optics a reality.
Optical Audio Cable: 5 Powerful Facts & Simple Setup Guide
An optical audio cable (TOSLINK) sends digital sound as pulses of light through a fiber optic strand. This guide covers how it works, how it compares to HDMI and coaxial audio, when to use it, and how to set it up for your home theater or sound system.
Fiber Optic Lighting: 7 Stunning Facts & How It Works
Fiber optic lighting uses thin glass or plastic fibres to pipe light from a source to wherever you need it — with no electricity at the delivery point, almost no heat, and colours that never fade. This guide covers how it works, the two main types (end-glow and side-glow), system components, and applications from pools and museums to car dashboards and light piping.