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Here we have to recall the refraction phenomenon of light through a glass prism. The net effect of the ray after passing through the prism will be the deviation towards the base of the prism.

So in case of concave lens, it can be imagined to be made up of many prisms with their base seated towards the edges of the concave lens. Hence the parallel beam entering will be diverted towards the edge and so the rays are to be diverged. So no chance of convergence and hence no focusing.

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