Magnification And Power Flashcards
1
Q
What is the formula for magnification?
A
Image height / Object height
2
Q
What is the formula for power of an image in diopters?
A
1 / focal length (metres)
3
Q
What are the powers of concave and convex lenses?
A
Convex = positive power Concave = negative power
4
Q
What does focal length depend on?
A
1) Refractive index of lens
2) Curvature of two surfaces of the lens
5
Q
For a given focal length, what is the relationship between refractive index and lens shape?
A
Bigger refractive index = flatter lens
6
Q
How can powerful lenses be made flatter?
A
By having bigger refractive indexes
7
Q
What does a magnifying glass create and with what?
A
A magnified, virtual image with a concave lens
