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concave lens has negative focal length why​

Sagot :

if it does do it then yeah it will for it
biddyboom2
For focal length, f in lens is always taken as negative for concave and positive for convex. ... It is taken as negative in Concave lens since image is formed in -X side of the Cartesian. In Concave mirror V is taken as positive and negative for convex mirror.
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