Respuesta :

The fact that a double convex lens is thicker across its middle is an indicator that it will converge rays of light that travel parallel to its principal axis. A double convex lens is a converging lens. A double concave lens is also symmetrical across both its horizontaland vertical axis.
This is from google btw.
bemiwel
A concave lens ‘caves in’. A convex lens goes out like a bubble-shape. I don’t know of this will help, but use it if you can.

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