The question is incomplete. You need to specify what we are talking about before I can answer if it will converge light rays to a single focal point on a specimen.

Here's what you need to provide for a complete question:

* What is the object in question? Is it a lens, a mirror, a microscope, or something else entirely?

* What kind of light are we talking about? Is it parallel light rays, diverging light rays, or a specific type of light source?

Once you provide this information, I can answer your question accurately.