my question is when does a lens and mirror combination have an i3. cause there are examples in the internet that doesnt have i3 such as https://www.youtube.com/watch?v=aGHnH_4KFRE. and there...

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my question is when does a lens and mirror combination have an i3. cause there are examples in the internet that doesnt have i3 such as https://www.youtube.com/watch?v=aGHnH_4KFRE. and there...

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1. (3/2x)+(5/x)=(13/6) 2. X2-2.5x+1=0 3. (17/2x+1)=(17/5) 4. 2.5x2+3x+0.5=0 5.(x/x-2)=(7/x-2)

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