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Takuza
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Homework Statement
We are to derive the Gaussian formula for a case with a virtual object, a virtual image, and a concave surface.
Homework Equations
Snell's law, n(sin(phi)) = n'(sin(phi'))
geometry
The Attempt at a Solution
I can do a derivation for a situation with a point object placed to the left of a convex surface with a real image being formed, but I don't understand what it means to have a virtual object together with a virtual image, much less for a concave surface.