Page 94 - Science Course 3 (Book 2)

Mo10-L6b: What are the Types of Lenses?

A concave lens is curved inward on at least one side SUMMARY
and thicker at the edges.

What are the Types of Lenses?
The image formed by a concave lens is upright and
smaller than the object. A lens is a transparent object with at least
on curved side that causes light waves to
Concave lenses are usually used in combinations change direction. The shape of the lens and
with other lenses in instruments such as telescopes the position of the object determine how the
and microscopes. image appears.

Center
Thickness

<------- Focal Length ------->

Time of Image
Lens Shape Location of Object Virtual/Real Size
Upright/ Inverted
Object beyond 2 focal lengths from real inverted smaller than
lens object
larger than
Convex Object between 1 and 2 focal lengths real inverted
object
larger than
Object within 1 focal length virtual upright
object
smaller than
Concave Object at any position virtual upright
object

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