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Physics A First Course
Light and Optics
Chapter 23
Light and Optics
Optics
 23.1
 23.2
 23.3
Optics and Reflection
Refraction
Mirrors, Lenses, and Images
Chapter 23.1 Objectives and Vocabulary

Describe how simple
optical devices work.
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Learn the difference
between converging
and diverging lenses
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Understand how light
is affected by matter.
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Learn about the law
of reflection.
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optics
light ray
converging lens
diverging lens
prism
transparent
translucent
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specular reflection
diffuse reflection
incident ray
normal line
reflected ray
law of reflection
ray diagram
Simple Optical Devices

mirrors

prisms

lenses
— corrective
— magnifying
Four ways light is affected by matter:
Review Reflection and Refraction

Reflection occurs when light bounces off a surface.

Refraction occurs when light bends crossing through
materials.
Law of Reflection
The incident ray
strikes the mirror.
The reflected ray
bounces off.
The angle of
incidence equals
the angle of
reflection.
23A Investigation: Optics
Key Question:
How are images created by
lenses and mirrors?
*Students read text section 23.1 AFTER Investigation 23A
23A Investigation Topics

View images with
lenses.

Project images with
lenses.

Find the magnification
of a lens.
Chapter 23.2 Objectives and Vocabulary

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Describe what happens when
light goes from one material
into another.
Understand the index of
refraction.
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Learn about total internal
reflection and fiber optics.
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Learn how different colors of
light are refracted.
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index of refraction
angle of reflection
total internal
reflection
critical angle
fiber optics
dispersion
Refraction and colors of light

Rainbows are
formed when
refracted light
passes through
water droplets.
23B Investigation: Optics and Images
Key Question:
How are images formed by light?
*Students read text
section 23.3
AFTER
Investigation 23B
23B Investigation Topics

Draw a ray diagram.

Determine the focal point of a lens.
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Measure focal length.
Chapter 23.3 Objectives and Vocabulary

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Learn how images form.
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Learn the difference between a
real and virtual image.
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Learn the parts of a ray
diagram and how to draw one.
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object
image
virtual image
optical axis
vocal point
focal length
real image
focus
magnification
refracting telescope
Function of the pupil

The pupil gets
smaller blocking
more of the lens in
bright light.

Covering part of the
lens reduces the
amount of light
allowed in and but
doesn't alter the
image seen.