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Flat Refracting Surfaces<br />
• The image formed by a flat<br />
refracting surface is virtual<br />
and on the same side <strong>of</strong> the<br />
surface as the object. All<br />
rays are assumed to be<br />
paraxial.<br />
n n<br />
1<br />
= −<br />
2<br />
p q<br />
q<br />
= −<br />
n<br />
n<br />
2<br />
1<br />
p