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Ray, ray diagram
Ray, ray diagram
The path that a thin beam of
light would take. A ray diagram is used by scientists to plot the path that single beams of light would take. That helps in finding out how lenses and mirrors behave. Most of the diagrams in this book are ray diagrams.
A ray diagram for a mirror
A ray diagram for a convex lens
F
F Image, I
Real image
Reed
A thin blade of cane or metal placed between a musical instrument player’s mouth
and the sound chamber of the instrument. When the player blows across the reed, it makes the reed vibrate, setting up a vibration in the air of the sound chamber.
The simplest reed is called a ribbon reed. It is a blade of grass that is held taut in front of the player’s mouth. When air is blown over the reed, it vibrates and produces a harsh squawking sound.
 Reed – These are reeds from musical instruments. The bagpipes are a reed instrument.
Drones
Air bag Pipe
An image that can be seen on
a sheet of paper or made into
a photograph. A real image is produced by a convex lens, which bulges in the centre, providing the source of light is at some distance from the lens. A real image is upside down and back to front. You can see that by opening the back of a camera and looking through the lens while the shutter is open (take out any film first).
36
Object O
 Ray, ray diagram – These two diagrams illustrate how two rays are drawn to find the way light behaves. When working with a mirror, a single ray may be enough. When working with a lens, one ray is drawn from the top of an object parallel to the axis of the lens and the second through the centre of the mirror. The focus (image) of the object is where the rays meet.
Eye
Object O
Reed