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13 cards from this deck
By refracting light
Thicker in middle than at edges
Thicker at edges, thinner in centre
Refract it inwards towards principal focus
Cause it to diverge (spread out)
Distance from lens centre to principal focus
Passes through principal focus
Leaves parallel to axis
Appears to come from principal focus
Light coming together (e.g., on screen/retina)
Only convex lenses
Light rays diverging
Concave lenses
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