Geometric Optics - Optics | Focal Length | Lenses - PhET Interactive Simulations
How does a lens or mirror form an image? See how light rays are refracted by a lens or reflected by a mirror. Observe how the image changes when you adjust the focal length of the lens, move the object, or move the screen.
Overview
Added
March 18, 2026
Subject & domain
physics · optics
Grade range
Grade 9 (Freshman)–Grade 12 (Senior)
Page kind
Tool
Introduction
Geometric Optics Simulation Overview
- Subject Matter: The simulation covers core concepts in optics, specifically focusing on focal length, lenses, and mirrors.
- Platform Compatibility: The simulation is built in HTML5, ensuring compatibility across iPads, Chromebooks, PCs, Macs, and Linux systems.
- Accessibility: PhET is actively integrating inclusive features for diverse learners; users are encouraged to check the "Accessible Sims" section for specific platform limitations and requirements.
- Current Version: 1.3.15.
- Technical Requirements: Optimal performance requires the latest versions of Chrome, Firefox, Safari, or Edge browsers.
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