Ophthalmic lenses

Question 1

Which way does a convex lens bend?

Answer 1

A convex lens will bulge outwards, like the back of a spoon

Question 2

Which way does a concave lens bend?

Answer 2

A concave lens will curve away, like the front surface of a spoon

Question 3

In optics, a convex surface is said to be what?

Answer 3

Positive or plus, and it causes light to become convergent, more convergent or less divergent

Question 4

In
optics, a concave surface is said to be what?

Answer 4

Negative or minus, and it causes light to become divergent or more divergent or less convergent

Question 5

What is a bi-convex lens?

Answer 5

Both sides have a convex surface, ie both surfaces bulge outwards

Question 6

What is a bi-concave lens?

Answer 6

Both sides have a concave surface, meaning both surfaces bend inwards

Question 7

What is a meniscus lens?

Answer 7

A lens that has both convex and concave surfaces. The positive convex surface on the front, the minus concave surface on the back.