It was written for specialists
The author assumes a degree you do not have, and the first chapter makes that clear.
For curious readers
The book has been on your shelf for years. Page forty is still where you stopped.
Upload the great hard book you always meant to read. Listen to it as lectures that explain instead of assuming, at a walk, in the car or with the drawings in front of you.
- No formulas if you prefer
- Stories and examples
- Listen anywhere
Ziehen Sie Ihr Buch hierher
EPUB, FB2, PDF, DjVu oder TXT, bis zu 200 MB
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What gets in the way
Summaries leave nothing behind
Ten minutes of key takeaways, and a week later you remember that the book exists.
No time to sit and read
The hours you have are on the road, at the gym, with your hands busy.
What changes
Ideas and examples, not formulas
At "Ideas and examples" every idea is explained through something everyday, and a term appears only if you will meet it again.
A lecturer you would choose
A storyteller who gives you the people and the discoveries, or a playful physicist with thought experiments: eight manners.
About your own life
Say you are a photographer, a cook or a sailor, and the examples come from there.
The whole book, not its headlines
The lectures follow the book chapter by chapter. Or take "Big picture" first: the whole book in about an hour.
Lesen, ansehen oder zuhören
Stimme, Zeichnungen und Text in jeder Kombination. Wechseln Sie jederzeit.
ExplaintedPhotographic Optics
StimmeBilderText
A thin lens forming an image
The first thing to know about a lens is how hard it bends light. Hold a magnifying glass in the sun: the rays arrive side by side, leave it leaning towards one another, and a little way behind the glass they meet in a bright dot. The distance from the glass to that dot is the focal length, and nearly everything else about the lens follows from it.
A lens is stronger when its glass is denser and its surfaces are more curved. Take ordinary glass, in which light travels one and a half times slower than in air, and curve both sides like a ball twenty centimetres across. Work it through and the focal length comes out at about ten centimetres: sunlight gathers into a point a palm's width behind the lens.
The book writes this as a formula, and we will come to it in a moment. It says no more than what we have just seen: denser glass or more curved surfaces, and the focal length gets shorter.
IntroductionTeil 1 von 17
1:238:22
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Introduction
A thin lens forming an image
The distance from the glass to that dot is the focal length, and nearly everything else about the lens follows from it.
A lens is stronger when its glass is denser and its surfaces are more curved.
1:238:22
1×
How to set it up
- 1
Upload the book
Any of the usual formats, scans too. Public-domain classics are easy to find.
- 2
Pick "Ideas and examples"
And a manner you would enjoy for ten hours: the sample lets you hear it first.
- 3
Listen
On your phone, in the browser, with your device’s own voice for free or a studio voice.
Questions
Is this a summary?
No. A summary shortens; this explains. At most levels the lectures are about as long as the book, because the missing steps and examples are put back in. Only "Big picture" is short on purpose.
Do I need to know anything first?
Choose a level without formulas and say in a sentence what you do know. The lecturer starts from there.
What does it cost?
The first ten pages are free. After that the price depends on the length you choose, and you see it before anything is made. Listening with your device’s voice adds nothing.
Also for
Students
The textbook the course is built on, at a level you can follow tonight.
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See a hard chapter explained five ways before you explain it yourself.
See how