Lenses Flashcards
1
Q
What’s refraction?
A
The change of direction of light as it passes from one medium to another
2
Q
How does a lens form an image?
A
By refracting light
3
Q
What is a convex lens also known as?
A
Converging
4
Q
What’s the focal length?
A
Distance from the lens to the principal focus
5
Q
What’s the principal focus?
A
Where parallel rays of light are brought to a focus
6
Q
Which 3 things define the nature of an image?
A
Relative size to an object,
Real or virtual,
Upright or inverted
7
Q
What can a converging lens be used as?
A
A magnifying glass
8
Q
What’s a real image?
A
One that can be captured on screen, and that light rays pass through
9
Q
What’s a virtual image?
A
One that can’t be captured on screen, and that light rays don’t pass through
