Unit 2 Optics

Chapter 5 Optical Systems Make Use of Mirrors and lenses

5.3 Using Lenses to Form Images

5.3 Concave Lenses pg. 191

Concave lenses are lenses that are thinner in the middle and thicker at the sides. When light rays pass through it, the rays are refracted outward and never meet at a focal point. It produces an image that is always upright and smaller than the actual size. Concave lenses are often used in combination with other lenses, some examples would be eyeglasses and telescopes.
Questions:
Answers


Why are images of objects seen through a concave lens smaller and more upright than the real object?
They are smaller because they never meet at a focal point.


In what objects are concave lenses used in with a combination of other lenses?
They are used in some types of eyeglasses and some telescopes.


How do concave lenses look like? Where is the thinnest part of the lens?
Concave lenses are thin in the middle and become bigger at the sides.


When light rays pass through concave lenses, how does it react?
The rays are refracted outward and never meet at a focal point.



Diagram:

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