Scroll over the [ ]'s to reveal the correct answer.

Lab 3: Properties of Lenses and Telescopes

Lenses

The shape of a convex (converging) lens looks like:

The shape of a concave (diverging) lens looks like:

An image would be called [Real] if it can be formed on a screen.
If it cannot be formed on a screen, we say it's a [Virtual Image].

The focal length of a lens [NEVER CHANGES].

The steps to making a ray diagram are:
 1) [IN Parallel : OUT through focal point]

 2) [IN through focal point : OUT Parallel]

 3) [Check ray: Straight through center of lens]

Telescopes

  There are 2 main types of telescopes: [Refractor] and [Reflector].

  A [refractor] use lenses, while a [reflector] uses mirrors.