Questions: Transparency, Translucency, and Opacity

Question 1

You hold up a piece of frosted glass. You can see light coming through but cannot make out the shapes of objects on the other side. What is this property called?

• A. Transparent — light passes through
• B. Translucent — some light passes through but images are blurry and unclear
• C. Opaque — the glass blocks the view
• D. Reflective — the glass bounces light back

Answer: (B)

Frosted glass is translucent. It allows some light to pass through, so the other side is not completely dark, but it scatters the light so you cannot see clear shapes. Transparent materials let you see clearly through them, and opaque materials block light completely.

Question 2

A thin material is typically transparent.

• T. True
• F. False

Answer: False

False. Thickness does not determine transparency. Aluminum foil is extremely thin but completely opaque — no light passes through. A sheet of clear glass can be quite thick and still be perfectly transparent. The type of material matters more than the thickness.

Question 3

Give one example each of a transparent, translucent, and opaque material.

Model answer: Transparent: clear glass (or clean water, clear plastic wrap). Translucent: frosted glass (or wax paper, thin fabric). Opaque: wood (or metal, cardboard, brick).

Transparent materials let light pass through clearly. Translucent materials let some light through but scatter it. Opaque materials block light entirely. Most objects around you are opaque, which is why you can see windows but not walls.