What is a single lense?

1 Answer
Jun 21, 2015

Answer:

A single lense is just one piece of glass (or other material), bounded by at least one curved surface.

Explanation:

Most photographic "lenses", or "lenses" in other optical devices, are made of multiple pieces of glass. Actually they should be called objectives (or oculars if at the eye-side of e.g. a telescope).

A single lens has all kinds of abberations, so it will not form a perfect image. That's why they are often combined.