Question

who discovered convex mirror

Answer 1

 William Jones and Samuel Jones

Answer 2

Jefferson intended using his concave mirrors, as well as the condensing lenses and scioptric ball he bought in London in 1786, with his microscopes. As he wrote in 1822, in microscopic observations, the enlargement of the angle of vision may be indulged, because auxiliary light may be concentrated on the object by concave mirrors.The reflecting mirror of a compound microscope would be placed at the focal point of the mirrors.