OpticsHard

Ray Optics and Optical Instruments

Mirrors, refraction, total internal reflection, lenses, prisms, microscopes and telescopes.

Instructions

1
The test opens in fullscreen when you press Start. Keep it in fullscreen until you submit.
2
Switching tabs, minimising the browser, opening another app or window, leaving fullscreen or reloading the page counts as leaving the test.
3
Every time you leave, you get a warning. You have 3 warnings. If you leave again after the last one, your test is submitted automatically.
4
The timer keeps running the whole time, including while a warning is on screen. At zero, the test is submitted automatically.
5
Marking: +4 for a correct answer, −1 for a wrong answer and 0 for a question you leave unanswered.
6
Your answer is saved as soon as you pick an option. Use "Mark for review" to flag a question you want to come back to.