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What are converging lenses?
light rays converge after refraction (F)
thickest in the middle and thinnest at the edge
What are diverging lenses?
light rays diverge after refraction (F’)
thinnest in the middle and thickest at the edge

What type of lens is this?
converging lens

What type of lens is this?
diverging lens
ray goes directly…
through the optical center
ray is parallel with the principal axis and becomes…
aligned at F
ray is aligned with F’ then…
the ray becomes parallel to the principal axis
thin lens equation

magnification equation
