A prism is normally colourless. White light, incident upon the prism, is broken down into a continuum of wavelengths. Although there are thus an infinity of colours, customarily, they are classed into the following seven: Red, Orange, Yellow, Green, Blue, Indigo and Violet.
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6, a rectagnular prism is essentially a cuboid.
There can be a heptagonal prism or an octagonal prism, but there is no such thing as a hectagonal prism.
A triangular prism has 2 bases on it!
It depends on what kind of prism you mean. For example, a rectangular prism has 6 bases and a triangular prism has 5 bases. A triangular prism only has two bases.
A pentagonal prism has 10 vertices. A rectangular prism has 8 vertices. Therefore, a pentagonal prism has 2 more vertices than a rectangular prism.