Question

1. scientists used to believe that prisms ______.

added additional colors to white light
had colored crystals embedded in themwhich altered the color of the light waves that left them
contained additional colors, despite their transparent appearance
changed the color of white light

Explanation:

Early scientific understanding held that prisms added new colors to white light, rather than separating the already existing components of white light. The correct historical belief matches this option, while modern physics shows white light is a spectrum separated by prisms.

Answer:

added additional colors to white light