Question

first principal focus of convex lens with drawing

Answer 1

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It is a point on the principal axis of the lens such that the rays of light starting from that point in case of a convex lens becomes parallel after refraction and in case of a concave lens a parallel beam of light appear to meet at that point after refraction.

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Answer 2

the point on the principal axis where rays incident parallel to the principal axis will pass through that point after getting refracted by the lens

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and about the image go to-

http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/raydiag.html