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M o d e l N o . O S - 8 4 7 0
E q u i p m e n t S e t u p
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source and object screen. To detach the light source, squeeze
the release lever and pull up.
Tabletop Placement
The light source can be placed on a tabletop in three ways:
vertically, horizontally, and flat, as illustrated below.
Tabletop placement
Point Source
The halogen bulb’s filament viewed “end on” closely approxi-
mates a true point source. It projects light through the round
opening in the case, but its actual location is about 3 cm
behind the outer surface of the case, as indicated by marks on
the tabs.
To use the point source, mount the unit on an optics bench or
carriage (see above), or place it vertically or horizontally on a
tabletop.
Illuminated Object
The object is a backlit, translucent screen with crossed arrows
printed on it. The pattern is asymmetrical so you can tell if
images formed with lenses and mirror are reversed or
inverted. Millimeter scales on both arrows allow you to mea-
sure the magnification of an image even if the entire image is
not visible.
To use the illuminated object, mount the light source on an
optics bench or carriage (see above), or place it vertically or
horizontally on a tabletop.
Ray Box
Ray wheel in 5-ray position
To use the light source as a ray box, place the unit flat on a
table top. Turn the wheel to select one, three, or five parallel
rays projected onto the table. A sheet of white paper placed
flat on the table makes the rays easier to see and allows you to
trace them with a pencil.
Use prisms, mirrors, and cylindrical lenses (such as those
included in the OS-8516A Ray Optics Kit) to study how the
rays are refracted and reflected.
Vertical
Horizontal
Flat
Point source
Position mark
on tab
Turn to select
number of rays
