What is Optics Calculator?
Optics Calculator is a free AI-powered physics tool that instantly computes answers and shows every step. Built into Backrow's Physics engine, it's designed for physics and engineering students, and working engineers who want a faster way to solve problems and check their work.
Common uses
- Last-minute physics homework
- Checking your work before turning it in
- Studying for exams when the textbook solution doesn't show enough steps
- Walking through practice problems with a peer or tutor
- For the optics unit when lenses and mirrors get confusing
How to use Optics Calculator
- 1
Open Optics Calculator
Go to backrow.ai/free/optics-calculator — free to try with the credits a new account starts with.
- 2
Paste your input
Drop in your content. Enter object distance and focal length...
- 3
Get your result instantly
Backrow processes the input and returns the worked output — usually in under 5 seconds.
- 4
Copy, save, or refine
Copy the result to your clipboard, save it to your Backrow workspace for later, or tweak the input and re-run.
Optics Calculator vs other tools
vs Wolfram Alpha
Backrow returns the answer in plain English with worked steps; Wolfram returns notation-heavy output that's hard to copy into homework.
vs Physics Classroom
Backrow solves your specific problem; Physics Classroom is general reference content you have to apply yourself.
vs Khan Academy
Backrow gives instant answers to your specific problem instead of a 12-minute lesson video.
Frequently asked questions
Do I need an account to use Optics Calculator?+
Yes — Optics Calculator calls an AI model, so it needs a free account. Signing up takes a minute, needs no card, and starts you with 200 credits. 14 of Backrow's calculators do run with no account at all; they are listed at backrow.ai/free.
Is Optics Calculator actually free?+
Yes — Optics Calculator is covered by the welcome gift. Every new Backrow account starts with 200 credits, one time, and Optics Calculator runs at zero credit cost. No card required to sign up.
How is this different from Wolfram Alpha?+
Wolfram Alpha is a great single-purpose tool. Backrow's Optics Calculator is one of 120+ tools in a single platform — alongside lecture recording, AI notes, flashcards, quizzes, and study guides. You stop juggling five subscriptions and switching tabs.
Will my professor catch me using this?+
Optics Calculator is a study aid, not a cheating tool. Use it the same way you'd use a calculator, dictionary, or office hours: to understand the work, not to dodge it. For assignments where AI is explicitly banned, don't use it. For everything else (problem sets, exam prep, learning a topic faster), it's fair game.
Do I need to download anything?+
No. Optics Calculator runs in your browser. Works on Mac, Windows, Linux, iOS, and Android. There's also a mobile-installable version (PWA) at backrow.ai if you want it on your home screen.
What other physics tools does Backrow have?+
Backrow's Physics engine includes everything from problem solvers to physics tools. See the full Physics catalog at backrow.ai/free or browse all 120 tools at backrow.ai/free.
Can I use Optics Calculator on my phone?+
Yes — Optics Calculator works in any modern mobile browser (Safari on iOS, Chrome on Android). The interface is touch-optimized for small screens.
Related tools
Free: the AI Study Toolkit
4 printable templates: a spaced repetition schedule, a lecture to flashcards workflow, a 7 day finals plan, and a one page cram sheet.