Convex

The video tutorial discusses the boundary of a circle and the historical use of convex lenses. Convex lenses have been utilized for vision correction, magnifying objects, and as burning glasses for approximately 3000 years.

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

• Radius

• Diameter

• Circumference

• Area

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

• 3000 years

• 500 years

• 2000 years

• 1000 years

Which of the following is NOT a use of convex lenses?

• Cooking food

• Magnifying auras

• Burning glasses

• Correcting vision

What is one of the historical uses of convex lenses?

• As a tool for navigation

• As a burning glass

• As a musical instrument

• As a writing tool

How many years have convex lenses been used as burning glasses?

• 1000 years

• 2000 years

• 3000 years

• 4000 years