Recent posts View all
Home of real teaching & learning
  • Full support for teachers
  • Focus on critical thinking
  • Engaging classroom activities
  • Integrated student eBook
  • Assessed tasks / qBank
  • Practice exam questions
Find out more Download brochure

The InThinking Guarantee: Our sites are written by expert practitioners and not by AI

See our AI policy

Disclaimer: InThinking subject sites are neither endorsed by nor connected with the International Baccalaureate Organisation.

Don't miss out, find out!
IB Approved Workshops
Physics
IB DP Category 1

Paris, France, 13 - 15 November 2026

Find out more
Physics: A focus on the experimental programme
IB DP Category 3

Paris, France, 19 - 21 February 2027

Find out more
Physics
IB DP Category 2

Berlin, Germany, 26 - 28 February 2027

Find out more
Virtual Think-Ins
Focus On: IB Teaching – A Practical Guide for Teachers new to the IB

20 November 2026

Find out more

Find all InThinking events at
inthinking.net

Waves on a beach

Mayssen is writing her EE on water waves, she wanted to analyse waves on a beach (she's from Morocco). But how do you measure changing wavelength from a photo taken from the land? The perspective messes everything up. Here's how, use GeoGebra to map rays from the photo onto the water. Here you can see the wavelength decreasing as the beach is approached, even though the photo looks like it's the other way round.

Help