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A typical thin lens consists of a piece of _____ or _____. It is ground so that the two surfaces are either segments of ______ or ______
Lenses are commonly used in optical instruments such as cameras, telescopes and microscopes to form images by ________
- glass or plastic
- spheres or planes
- refraction
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What are the two types of Thin Lenses?
Those two types break down into three further categories each, name them
The larger the radius the _____ the curvature (explain).
For both of the converging lenses and both of the diverging lenses, identify the focal point that would be used to find the focal length and the sign of the focal length
 - less
- Explanation: like how the curvature of a basketball are immediately apparent but those of the earth seem less apparent unless viewing from space
- From left to right:
- F2 (positive)
- F1 (positive)
- F1 (negative)
- F2 (negative)
**Focal length is positive when you have a converging lens and negative when you have a diverging lens
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The thin lens approximation assumes the thickness of the lens to be ______. So the focal point can be measured to the ______ or the ______ of the lens
Lenses will have ____ focal length(s) and _____ focal point(s)
- negligible
- center
- surface
- one focal length
- two focal points s
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Sign Convention of "Refracting Lenses"
We call the side from which the light approaches the front of the _____ or the ________ side
The other side is called the _______ side
State 7 differences between both sides
- lens or incident side
- refract side
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State when the following values are positive and when they are negative for Thin Lenses:
Object location (s)
Image location (s')
Image height (h')
R1 and R2
Focal length (f)
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Thin Lens Equation (same as Mirror Equation)
1/f = _____
s' = ______
Magnification:
m = _____ = _____
- **THIN LENS DOES NOT INCLUDE 2/R, THAT IS ONLY FOR MIRRORS
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The focal length for a lens in air is related to the _______ of its surfaces and to the ______ of ______ (__) of the lens material by the equation:
1/f = ________
R1 is the radius of curvature of the ______ surface and R2 is the radius of curvature of the _____ surface
- curvatures
- index of refraction (n)
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- front
- back
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Explain the 3 ways in which Rays begin on the incident side and end of the refracted side
- Blue and Red are usually most simple
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Converging Lens
When the object is in front of and outside the focal point of a converging lens, the image is _____, ______ and on the ______ side of the lens
f __ 0
s __ f
- real, inverted and on the back side of the lens
- f > 0
- s > f
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Converging Lens
When the object is between the focal point and the converging lens, the image is ______, ______, _______ than the object, and on the ______ side of lens
f __ 0
s __ f
- virtual
- upright
- larger
- front side
- f > 0
- s < f
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Diverging Lens
When an object is anywhere in front of a diverging lens, the image is ______, ______, ______ than the object, and on the ______ side of the lens
f __ 0
- virtual
- upright
- smaller
- front side
- f < 0
- **Note the focal length is negative
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How do these work for Converging vs Diverging Lenses?
f __ 0
s' = ______
What determines image in each?
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What are the 4 steps of Problem Solving with Thin Lenses?
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D. A ray of light passing through the center of convex lens would go straight without changing its direction. So option A and B are incorrect.
A convex lens is a converging lens. Parallel rays incident on a convex lens would not diverge as shown in option C.
**because d has the straight line in the middle
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D. We'll need a converging lens because the image is englarged and upright so it can only be at D or E. E is too far out so it has to be D.
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