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13 cards from this deck
Concave, thinner in centre, thicker at edges
Cause rays to spread out (diverge)
Always virtual
Passes straight through without bending
Appears to come from focal point on same side as object
Emerges parallel to principal axis
Virtual, upright, diminished, same side as object
1f=1u+1v\frac{1}{f} = \frac{1}{u} + \frac{1}{v}f1=u1+v1
Negative
Always positive
Correcting short-sightedness (myopia)
Peepholes to provide wide field of view
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