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Convex lens:-

• A convex lens focalizes light beams that travel parallel to its central pivot (i.e. merges occurrence beams towards the foremost hub) and is comparatively thick within the center and lean at the lower and upper edges.
• Rather than bending interior, the edges twist outward.

Concave lens:-

• A concave lens is one that has at least one deep down curving surface.
• It has a disparate focal point, which suggests that light beams refracted by means of it are extended out.

Distinguish between convex and concave lens by touching:-

• If it's convex lens the bended surface bulges outwards
• If it's a concave lens the bended surface bulges inwards.