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21 Cards in this Set

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Fermat’s principle

light takes the pathof least time.

Law of Reflection

Θi = Θr

Θi = Θr

Snell's Law

n1sinΘ1=n2sinΘ2

n1sinΘ1=n2sinΘ2

Focal Length

Distance from lens to focal point

Parallel rays..

pass through focal point

Rays through focal point..

become parallel

Rays through the centre...

are not bent

If an object is at a larger distance than 2f..

a real and inverted image is formed that is smaller

If an object is at a distance between f and 2f..

a real and inverted image is formed that is larger

if an object is at a distance smaller than f..

a virtual and upright image is formed that is larger

A diverging lens always forms a..

virtual, upright image that is smaller

Positive focal length

converging lens

Negative focal length

Diverging lens

Positive object distance

object to left of lens (real)

Negative object distance

only on optical systems

Positive image distance

image formed to right of lens (real)

Negative image distance

image formed to left of lens (virtual)

Positive Magnification

image is upright

Negative Magnification

Image is inverted

Thin Lens Equation

Magnification equation