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15 cards from this deck
Refraction
Thicker in middle, thinner at edges
Bend them towards each other
Thinner in middle, thicker at edges
Bend them away from each other
Magnifying glass
Spectacles for short-sighted people
Point where parallel rays meet
Distance from lens centre to principal focus
Short focal length
Can be projected onto a screen
Convex lens
Can see but cannot be projected onto screen
Concave lens
Through the principal focus
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