Three sides (plus ends).
Isaac Newton's triangular prism was likely made of glass, a common material for prisms during his time due to its transparency and ability to refract light.
A prism. It can be made of glass, crystal, or other hard clear material.
A glass prism is a three-dimensional transparent object with flat, polished surfaces that refract light. When light passes through a prism, it is bent or separated into its component colors, creating a spectrum. Prisms are commonly used in optics, spectroscopy, and photography.
Violet light changes direction the most when it leaves a triangular prism because it has the shortest wavelength and highest frequency compared to other colors in the visible spectrum. This causes it to refract more as it passes through the different mediums inside the prism.
A prism acts like a piece of glass that has two flat, non-parallel surfaces. Each surface of a prism behaves like a lens - one surface is concave and the other is convex. The combined effect of these surfaces is to bend light as it passes through the prism.
A triangular prism contains zero curved and 5 flat surfaces.
Four.
Four.
5
A triangular prism fits the given description
A triangular prism.
A triangular prism has 9 edges!
A triangular prism has 6 verticies
A triangular prism has 5 faces.
A triangular prism has five faces.
... are straight lines where two planar surfaces meet.
They are called faces.