A flat piece of glass. Also, any lens where the shape of the convex part matches the shape of the concave part. An example would be a flat piece of glass bent over a sphere.
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the objective lens has the power of that lens inscribed on it
Zero to any power is always zero.
It is 1 because everything to the zero power is 1.
The inconsistency is the following:Any number raised to the power zero is equal to one.Zero raised to any power is equal to zero.
Zero