Final answer:
The word 'sharp' has several synonyms such as 'keen', 'pointed', and 'abrupt', with 'crisp', 'lustrous', and 'glossy' being relevant when discussing reflections in mirrors or on polished metal surfaces.
Step-by-step explanation:
A synonym for sharp could be keen, which indicates an extreme edge or point that can easily cut or pierce something. Another synonym could be pointed, describing something that has a sharp or tapering end. Sharp can also describe a sudden or acute change in direction, in which case a synonym could be abrupt.
When considering the sharpness of an image, such as reflection in a convex mirror or a concave mirror, like those found in telescopes or Snap Labs, the term crisp can also be used. Moreover, in relation to the high quality of a reflection on a shiny surface, like a silver spoon polished with silver polish, one could use synonyms like lustrous or glossy to describe the sharpness and clarity.