Mr. Bustard took a triangular shaped bar of glass from his briefcase. “Does anyone know what this is?" he asked as the four children in his class examined it.
“Is it a mirror?" asked Anisa.
“No, it's not a mirror;” replied Mr. Bustard.
“It's a paperweight,” answered Nabil.
“No, it's not that. Do you have any idea what it is, Phillip or Sarah?"
They both shook their heads.
“This is called a prism. Can anyone guess what a prism does?"
Phillip raised his hand. “A prism is where they put people who break the law,” He giggled at his joke.
Mr. Bustard laughed too. “That's very funny, Phillip, but that's a ‘prison' not a ‘prism'." He spoke the two words distinctly so the children could hear the different sound. “A prism is used to separate light into different colors. Did you know that the light coming from this lamp contains all the colors of the rainbow?” He positioned the prism near the lamp and tilted it so it caught a ray of light. A rainbow of colors suddenly appeared on the opposite side. He held up a piece of white cardboard on which to reflect the different colors. The children were fascinated.