What is a Lens?
A lens is a transparent curved device that is used to refract light.
A lens is usually
made from glass. There are two
different
shapes for lenses. They are called convex and concave.
What is a Convex Lens?
A convex lens is thicker
in the middle and thinner
at the edges.
A convex lens is also called a converging
lens.
A convex lens will focus
light and make an image.
The image formed by a convex
lens is real and inverted
(and can be bigger or smaller
than the object)
unless it is being used as a magnifying glass
when
the image will be virtual,
upright and bigger than
the object.
What is a Concave Lens?
A concave
lens is thinner in the middle
and thicker at the edges.
A concave lens is also
called a diverging lens.
A concave lens will disperse
light and make an image
that is always virtual,
upright and smaller
than the object.
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