Answer:
1. Light or visible light is electromagnetic radiation within the portion of the electromagnetic spectrum that can be perceived by the human eye. Visible light is usually defined as having wavelengths in the range of 400–700 nm, between the infrared and the ultraviolet.
2. Transparent objects allow light to travel through them.
Translucent objects allow some light to travel through them.
Opaque objects block light from traveling through them.
