01
Lens
Images formed by convex & concave lenses
OPTICS SIMULATOR
Watch light
Watch light
find its way.
Bend, split, and mix light — and see why it happens
From lenses, mirrors and the human eye to prisms, gratings, polarization and thin films — plus rainbows, the color of the sky and the photoelectric effect. 12 simulations you can touch and explore.
Free12 simulations73 languagesNo accountiPhone · iPad · Android
12simulations
3categories
$0no in-app purchases
73languages
Simulations
12 simulations
Three categories: rays and images, light as a wave, and color and the nature of light. Drag and slide to see rays and colors change instantly.
Rays & Images5
02
Mirror
Images in concave & convex mirrors
03
Eye & GlassesNEW
Correct near- and farsightedness
04
Prism
Split white light into a spectrum
05
Fiber
Carry light far by total reflection
Light as a Wave3
06
Grating
Light reinforced through fine slits
07
Thin Film
Why soap bubbles show colors
08
Polarization
Brightness through two polarizers
Color & the Nature of Light4
09
Color Mixing
Mixing light vs. mixing paint
10
Rainbow
Raindrops split sunlight
11
Blue Sky & SunsetNEW
Scattering decides the sky's color
12
Photoelectric
Light knocks out electrons
Features
Built for learning
Hands-on
Change focal length, angle of incidence, wavelength or polarizer angle with sliders and drags, and watch the rays and colors respond.
Readable at a glance
Symbols such as the focal point (F) and center of curvature (C), and every colored ray, come with a legend and labels.
Explanations with formulas
Every screen explains the physics behind it — the lens equation, Snell's law, Malus's law, E = hf and more.
73 languages
English, Japanese, Chinese, Korean, Spanish, Arabic and 67 more. The app follows your device language automatically.
Free, no account
Every feature is free. No in-app purchases, subscriptions or sign-in. The only ad is a Pangle banner at the bottom.
Easy to use anywhere
Dark and light themes, landscape, iPad and tablets, and larger text. With VoiceOver or TalkBack, each screen reads out its result, such as whether the image is real or virtual or whether light is totally reflected. The simulations work offline.
Pricing & ads
The app is free. There are no in-app purchases, subscriptions or paid unlocks, and no account is needed.
A Pangle banner ad is shown at the bottom of the screen. On iOS, the App Tracking Transparency (ATT) prompt appears at launch, and ads are personalized only if you allow tracking. On Android, the app asks once whether ads may be personalized. Either choice can be changed later from "About" > "Ad settings".
Requirements: iPhone and iPad with iOS 15.0 or later; Android 7.0 (API 24) or later phones and tablets.
Download
Optics in your pocket.
Free on the App Store and Google Play.