Refraction and the Lens-users Eq.

f

f

Notice that: s’ is on the “wrong” side, which

means that s’ < 0 , and that |s’| > |s| so f > 0.

s

ray 1

ray 2

ray 3

s’

h’

Example: 1 / 5 cm = 1 / 4 cm + 1 / -20 cm

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