Prep1.U2L2.2011

What is the earliest known material used as a mirror?

• Obsidian

• Aluminum

• Copper

• Glass

Why do rough surfaces not act as mirrors?

• They reflect light at the same angle

• They bounce light in different direction

• They are too smooth

• They are made of glass

What was the problem with the mirrors made of polished copper?

• They were blurry

• They absorbed light

• They were too expensive

• They were too heavy

What material is used to coat modern mirrors?

• Silver

• Platinum

• Gold

• Copper

What did Venetian craftsmen coat clear glass with to create modern mirrors?

• Tin and mercury

• Copper and zinc

• Gold and platinum

• Aluminum and silver

What is the main reason for the near perfect reflection of modern mirrors?

• Coating with obsidian

• Using volcanic glass

• Polishing

• Factory precision

What is the main difference between smooth and rough surfaces in terms of reflecting light?

• Rough surfaces reflect light at the same angle

• Smooth surfaces absorb light

• Rough surfaces absorb light

• Smooth surfaces reflect light at the same angle

What was the very first type of mirror used by humans?

• Obsidian glass

• Modern manufactured glass

• Dark pools of still water

• Polished copper