# Optics

> Light behavior and optical systems

- Skill: `ffsshhttiikk/optics` (Agent Skill)
- Install (CLI): `npx skillmds@latest add ffsshhttiikk/optics`
- Raw SKILL.md: https://api.skillmd.com/api/skills/ffsshhttiikk/optics/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- License: MIT
- Author: ffsshhttiikk (https://skillmd.com/u/ffsshhttiikk)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/ffsshhttiikk/optics

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## What I do
- Analyze geometric optics and lens systems
- Model wave optics and interference patterns
- Calculate diffraction and grating spectra
- Design optical instruments (telescopes, microscopes)
- Study polarization and birefringence
- Analyze laser cavities and coherence

## When to use me
When designing optical instruments, analyzing light behavior, or studying photonic devices.

## Key Concepts
- **Snell's Law**: n₁sinθ₁ = n₂sinθ₂ for refraction at interfaces
- **Thin Lens Equation**: 1/f = 1/do + 1/di for image formation
- **Interference**: Path difference Δ = mλ for constructive/destructive
- **Diffraction**: sinθ = mλ/a for single slit, d sinθ = mλ for grating
- **Malus's Law**: I = I₀cos²θ for polarized light through analyzer
- **Rayleigh Criterion**: θ = 1.22λ/D for angular resolution