2. When was the first lens invented?
a) 100000 B.C.
b) In the first century
c) It’s a sad mystery
d) Lenses were invented by Johann Sebastian Bach in 1727

3. What does a convex lens look like? (Click the images to view the full size image)

a)

b)

c)

d)

4. When was the first contact lens used?
a) In 1887
b) In 300 B.C.
c) The first lens was a contact lens, so they were invented when lenses were invented.
d) In 1729 by Johann Sebastian Bach

5. What does a concave lens do to light?
a) It turns it into a laser
b) It concentrates the light (and it may burn you too)
c) It diverges (spreads out) the light
d) It bends light sideways

6. How does a concave lens correct myopia?
a) By bending light inwards
b) By bending light outwards
c) By taking a lot of photos and sending them to the brain
d) It doesn’t

7. What image do you see when you look through a microscope?
a) A virtual image
b) A PNG image
c) A real image
d) A thumbnail image

8. What is the worst type of binoculars?
a) Porro-prism binoculars
b) Galilean binoculars
c) Reflecting binoculars
d) Roof-prism binoculars

9. Who made the first convex lens?
a) Roger Ham
b) Seneca
c) Bill Brown
d) Roger Bacon

10. What is the thinnest part of a lens called?
a) The base
b) The center
c) The bottom
d) The apex

11. A refracting telescope contains:
a) Two mirrors
b) Two convex lenses
c) Two concave lenses
d) A mirror and a convex lens

12. Which of the following statements about astigmatism correction is correct?
a) Astigmatism cannot be corrected by lenses
b) In conjunction to the astigmatism correction, the lens may contain a correction for myopia and hyperopia
c) In conjunction to the astigmatism correction, the lens may contain a correction for myopia or hyperopia
d) A prism is used to correct astigmatism