What this practice covers
These questions are drawn from past CIE 0625 Physics papers and filtered to light. You answer, you find out immediately whether you were right, and you get the reasoning for the correct option and for each distractor. Wrong answers go to a mistakes locker so you can come back to exactly those.
Practice is free. You need an account only so your progress and your mistakes are still there next time.
Start practising practice questions →
What examiners see students get wrong here
These are the errors that cost marks on light, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Measuring angles from the surface instead of from the normal.
- Dividing the angles rather than their sines when finding a refractive index.
- Giving a speed of light in a medium greater than its speed in a vacuum.
- Saying total internal reflection can happen going from less dense to more dense.
- Forgetting that a larger refractive index means a smaller critical angle.
- Calling the image in a plane mirror real.
- Drawing a ray through the centre of a lens as if it bends.
- Saying red is refracted most in a prism.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Light revision notes.