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Flashcards in Lenses Deck (11):
1

What is a Concave (Diverging) lens?

A lens that spreads beams of light out

2

What is a Convex (Converging) Lens?

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

3

What type of vision problem do Concave Lens' fix?

Short Sightedness

4

What type of vision problem do Convex Lens' fix?

Long Sightedness

5

What is Short Sightedness?

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

6

How do Concave Lens' correct Short Sightedness?

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

7

What is Long Sightedness?

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

8

How do Convex Lens' correct Long Sightedness?

The convex lens focuses the light closer in onto the retina

9

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

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

10

What are the uses of a Convex lens?

Magnifying Glass
Camera
Eye
Projector
Microscope
Telescope

11

What are the uses of a Concave Lens?

Spy Holes
Back windows of Coaches