Use the optical bench applet to help you distinguish between a converging (convex) and diverging (concave) lens
Converging (convex) lens is thicker in the middle, and as the light rays pass through, they converge (meet) at one point.
Below shows an image of the optical bench applet with beams (many parallel light rays) passing through the convex lens.
Diverging (concave) lens is thinner in the middle, the lens curves in.
As the light rays pass through, they diverge (spread out), the rays do not meet like the convex lens.
Below shows an image of the optical bench applet with beams (many parallel light rays) passing through the concave lens.
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