Question

which lens should be drawn at A? why?
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Answer 1

Then draw a perpendicular line (at 90°) to the tangent. Tangent and normal line drawn on a concave lens diagram. The normal line is the arrow that would exist if ...

Answer 2

Answer:

begin{gathered}2 \frac{ \\ 521 \\ x {y2xx56 - - + yy -x \\ \times \frac{?}{?} }^{2} }{?}\end{gathered}