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Light T-Notes
Name_____________________
Section 1
When Light Strikes an Object
*Light can be reflected, ____transmitted______ , or
__absorbed_____.
Examples:
A. Reflected
_light bounces back____
ex______________
B. Transmitted ____light passes through______
ex______________
C. Absorbed ____light is soaked up_________
ex______________
*Transparent materials __transmits (you can see clearly, lets through)_
most of the light that strikes it.
Example: __clear glass, sunglasses, water, air___
*Translucent materials ____scatters (shadowy or blurry)__ light as it
passes through.
Example: ____wax paper, frosted glass__________
*Opaque materials _reflect_____ or ____absorb_______
light that strikes it.
all of the
Example: ___wood, metal_____________________
The Color of Objects
*The color of an opaque object is the color of the light it
___reflects___.
The color of transparent or translucent objects is the color of light it
__transmits (let through)______.
Combining Colors
*___Primary_______ colors are three colors that can
combine to make any other color.
R
*Two primary colors combined in equal amounts produce
O
___secondary______ colors.
Y
G
*The primary colors of light are ___red_______,
B
____green_______, and ____blue___________.
I
When combined in equal amounts they make
V
______white_______ light.
*The Secondary colors of light are _____yellow__________,
_____cyan________, and ____magenta_______.
*Any two colors that when combined make white light are called
________complementary____________ colors.
*The color of a pigment that you see is the result of the color of light
that is being _______reflected__________.
*The primary colors of pigments are _______cyan____,
_______yellow________ and _______magenta___________.
*The secondary colors of pigments are ___red_______,
________green____, and ________blue______.
Diagram the interaction of colors of light and pigments on the next page.
Colors of Light
Colors of Pigment
Section 2
Reflection of Light Rays
*____regular____ reflection occurs on a smooth surface.
Example:
Mirros, highly polished surfaces, glass, metal, still water
*___Diffuse________ reflection occurs on uneven or bumpy surfaces.
Example:
Plane Mirror
*A _____plane____ mirror is a flat sheet of glass that has a smooth
silver coating on one side.
*Plane mirrors produce a ___virtual_____image which means that the
image is right side up.
Example:
Concave Mirror
*The surface of a concave mirror ___curves (bowl)_____ inward.
Concave mirrors focus light to a point called the
______focal point______.
*A ______Real___________ image appears upside down.
*Concave mirrors produce ____virtual____ and
_____real__________ images.
Example:
Convex Mirror
*Convex mirrors curve ___outward_______. The light
rays never meet when reflected so objects in this mirror are always
__virtual_____ and __smaller________ than the object.
Example:
Section 3
Refraction of Light
*Refraction happens when light rays enter a medium at an angle, the
change in _____speed______ causes the rays to
_bend_________ or change direction.
*How much a light ray bends depends on a material’s
___index______ of refraction.
*Rainbows: The longest ___wavelength (red)______ bent the least.
*Mirages: Caused by light refracting as it changes __direction____
through different ___temperatures_______ of air.
Lenses
*A lens is a __curved__________ piece of glass or other
_____transparent___________ material that is use to refract light.
*Convex lenses are ____thicker_____ in the center than on
the edges. Convex lenses form ____real_________ or
__virtual______ images depending on position of the focal point.
Example:
*Concave lenses are ___thinner______ in the center than on
the edges. Concave lenses can make only __virtual______ images.
Section 4
Seeing Light: Use with Eye Packet
Section 5
Using Light: Skim the section and summarize 3 applications of light that are explained
in the section.