Chapter 19 – Section 3
Why do light rays
bend when they
enter a medium at
an angle?
Refraction of Light
- ____________________ can cause you to see something
that may not actually be there.
* When light rays enter a medium at an angle, the change
in speed causes the rays to ________, or change direction.
Light travels fastest in _____________……….
A little slower in _______________ ……….
and even slower in _____________.
Index of Refraction
- A measure of how much a ray of light bends when it
_________________ that material.
*Rainbows occur when white light from the sun shines
through droplets of water. The droplets act like
_______________.
______________
- An image of a distant object caused by refraction of
light.
What determines
Convex Lenses
the types of images
- A piece of transparent glass curved so that the
formed by convex
_______________ is __________________ than the
and concave lenses? edges.
*An object’s position relative to the focal point
determines whether a convex lens forms a real image or a
virtual image.
Examples: 1) _________________ 2) _________________
Concave Lenses
- A piece of transparent glass curved so that the
_______________ is __________________ than the
edges.
* Can produce only virtual images because parallel light
rays passing through the lens never meet.
Examples: 1) _________________ 2) _________________
Summary: