Light rays
Light from a source travels in straight lines. A beam of light, made when light passes through a gap, is many rays together, and a ray - the thinnest beam you can imagine - is drawn as a straight line with an arrow to show light's path. A beam's rays can be parallel, spreading (diverging) or coming together (converging). Sources can be wide (extended) or so small or far they act as a point. Because light goes straight, a box with a pinhole makes an upside-down picture of what is in front of it.
Depth 1 · Foundation
You know that light travels in straight lines, can draw its path as rays, tell parallel, diverging and converging beams apart, and explain why a pinhole camera's picture is upside down.
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- 1
Foundation
You know that light travels in straight lines, can draw its path as rays, tell parallel, diverging and converging beams apart, and explain why a pinhole camera's picture is upside down.
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