Learning target

Explain that seeing an object requires light reaching the eyes.

Vocabulary and key concepts

Objects that emit light; reflected light; eyes; paths

Accuracy notes

No wavelength calculations, Snell's law or looking at the Sun/lasers. Refraction and dispersion remain clear qualitative extensions.

Setup

Open this page in a current browser with internet access. Choose Start / resume adventure to enter the player. No account, email, purchase, kit, worksheet or earlier lesson is needed. The briefing teaches the science used in the challenges.

Classroom use ideas

Use this lesson for teacher-led discussion, partner investigation or independent practice with reading support as needed. Ask students to explain which evidence supported a choice. The checks offer feedback and retries; there is no gradebook.

Saving and shared devices

Progress is saved in this browser profile. Shared profiles share progress; there is no cross-device sync. Some browsers keep embedded and full-screen saves separate. If the embedded player cannot save, open this same adventure full screen.

Curriculum reference