New idea
Light moves in straight lines
Light from the sun, a lamp, or a torch travels in STRAIGHT LINES. When an object blocks the light, the area behind it stays dark — that's a SHADOW.
Light travels in straight lines — when something blocks it, you get a shadow.
New idea
Light from the sun, a lamp, or a torch travels in STRAIGHT LINES. When an object blocks the light, the area behind it stays dark — that's a SHADOW.