Convex

What is the term used to describe the outer edge of a circle?

• Circumference

• Diameter

• Radius

• Area

For how long have convex lenses been used to correct vision?

• 3000 years

• 2000 years

• 1000 years

• 500 years

What is one of the historical uses of convex lenses?

• To create holograms

• To magnify auras

• To project images

• To measure time

Which of the following is NOT a use of convex lenses mentioned in the video?

• Burning glasses

• Cooking food

• Magnifying auras

• Correcting vision

How long have convex lenses been used as burning glasses?

• 4000 years

• 1000 years

• 2000 years

• 3000 years