Physics – Leaving Cert

Quick Notes


The most important topic in the study of refraction is that of lenses. Within a lens, the light bends on entering the lens and again on exiting the lens.

There are two main types of lenses

Converging (convex)


Diverging (concave)

concave lens


As a lens has two refracting surfaces, a lens has two focal points, one on either side of the lens.(Note – for lenses we don’t talk about C, we talk about the position 2F)

The midpoint of the lens is called the ...

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