Diverging Lens
Rays of light entering a diverging lens parallel to its axis are diverged, and all appear to originate at its focal point F. The dashed lines are not rays—they indicate the directions from which the rays appear to come. The focal length f of a diverging lens is negative. An expanded view of the path taken by ray 1 shows the perpendiculars and the angles of incidence and refraction at both surfaces.
Source
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"OpenStax College, Image Formation by Lenses. December 29, 2012."
http://cnx.org/content/m42470/latest/#import-auto-id1625442
OpenStax CNX
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