3 • Lenses
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25 Terms
Define Lense
A curved piece of glass, which causes light to bend in a particular way
Name the type of lens in this image
Converging / Convex Lense
Name the type of lens in this image
Diverging / Concave Lens
What happens to a light ray parallel to the axis?
Passes through the focus
What happens to a light ray striking the pole?
Passes straight through
What happens to a light ray reflecting through the focus?
Passes parallel to axis
What type of image is formed in this diagram?
Converging Lens - Object more than 2F away
Real
Inverted
Diminished
What type of image is formed in this diagram?
Converging Lens - Object 2F away
Real
Inverted
Same Size
What type of image is formed in this diagram?
Converging Lens - Object between F & 2F
Real
Inverted
Magnified
What type of image is formed in this diagram?
Converging Lens - Object at F
Real
Inverted
Cant Comment On Size
What type of image is formed in this diagram?
Converging Lens - Object inside F
Real
Upright
Magnified
What type of image is formed in this diagram?
Diverging Lens
Virtual
Upright
Magnified
Name 3 uses of a Converging Lens
Magnifying glass
Long Sighted Spectacles
Camera Lenses
Name 3 uses of a Diverging Lens
Camera Lenses
Door peephole
Short Sighted Spectacles
Label This Formula
The Distance Formula
v - image distance
u - object distance
f - focal length
When is u positive and negative?
U is always positive
Never negative
When is v positive and negative?
Positive - Real Images
Negative - Virtual Images
When is f positive and negative?
Positive - Converging Lens
Negative - Diverging Lens
Label This Formula
Magnification Formula
m - magnification
v - image distance / height
u - object distance/ height
When is magnification positive and negative?
Positive - Upright
Negative - Inverted
Label This Formula
Power of a Lens
P - Power
f - focal length
Define the SI Unit for Power of a Lens
m-1
Label This Formula
Power of combining lenses
P - total power
P1 - power of lens 1
P2 - power of lens 2
Label This Formula
Focal Length of Combining Lenses
f - total focal length
f1 - focal length of lens 1
f2 - focal length of lens 2
Differentiate between Converging and Diverging Lenses
Converging - Positive Powder
Diverging - Negative Power