Lenses

Question 1

What is a Concave (Diverging) lens?

Answer 1

A lens that spreads beams of light out

Question 2

What is a Convex (Converging) Lens?

Answer 2

A lens that brings a beam of light to a focus (used in the eye)

Question 3

What type of vision problem do Concave Lens’ fix?

Answer 3

Short Sightedness

Question 4

What type of vision problem do Convex Lens’ fix?

Answer 4

Long Sightedness

Question 5

What is Short Sightedness?

Answer 5

In short sight, beams of light from a distant object focus in front of the retina
You can’t focus on distant objects

Question 6

How do Concave Lens’ correct Short Sightedness?

Answer 6

The concave lens spreads out the light so it focuses on the retina

Question 7

What is Long Sightedness?

Answer 7

In Long sight, beams of light from a nearby focus behind the retina
You can’t focus on nearby objects

Question 8

How do Convex Lens’ correct Long Sightedness?

Answer 8

The convex lens focuses the light closer in onto the retina

Question 9

What are the different types of image that lenses produce and what do they mean?

Answer 9

Magnified (made larger)
Upright (same way up as object)
Diminished (made smaller)
Inverted (upside down)
Virtual 
Real

Question 10

What are the uses of a Convex lens?

Answer 10

Magnifying Glass 
Camera 
Eye
Projector
Microscope
Telescope

Question 11

What are the uses of a Concave Lens?

Answer 11

Spy Holes

Back windows of Coaches