Transparency

Depending on the amount of light that can pass through them, objects have different transparency — they can be considered transparent, translucent, or opaque.

• Transparent objects like eyeglasses or water look clear, and as light passes through them, you can see they cast a barely visible shadow.
• Translucent objects like most paper let some light through, and their shadows are slightly darker.
• Opaque objects like our bodies don't let the light pass through them, and they have very dark shadows.