Physics GCSE
principal axis
What principal axis means in Physics GCSE, as defined for AQA.
Definition of principal axis
Check what you remember
Read the wording for your board, then hide it and explain principal axis in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
A line drawn through the centre of the lens at right angles to the line representing the lens.
Topics that use principal axis
- Lenses (physics only) (AQA GCSE)
Related terms
- always virtual
- arrowheads in or out
- converging and diverging
- diverging lens
- dotted projections
- magnifying glass
- matched comparison
- real image
Using principal axis in the exam
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