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Answer 1 · 2017-12-12T00:31:10

Concave lens/Diverging lens

This is because the shape of the lens is concave (You will have to memorize this, unfortunately).

This lens is also called a diverging lens. As you can see in the diagram, the light rays are shown to be diverging outwards.

Hope that made sense!

Answer 2 · 2017-12-12T00:34:33

This is a concave lens.

Concave lenses are thicker at the top and bottom but thinner at the middle. Rays of light that pass through the lens are spread out.