Light is a element that makes objects visible. Light has many propertys.
One property of light is that it can not travel through opaque objects. This was proven by putting an opaque object in front of the torch. The results were that a torch can not travel through opaque objects.
A second property is that white light can be spilt into many colours. This was proven by light traveling through a prisim that spilt the white light into many colours.
A third property is that light travels in a straight line. This was proven by putting a peice of card with a small rectangle hole and measuring the directions of the light. The results was light can travel in straight lines.
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