Refraction Flashcards
(52 cards)
1
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A
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3
Q
State Snell’s Law
A
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8
Q
Define critical angle
A
9
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10
Q
Draw what happens when the angle of incidence is less than c
A
11
Q
Draw what happens when i=c
A
12
Q
Draw what happens when i>c
A
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23
Q
Define the principal focus of a lens.
A
In the case of a converging lens, it is the point where parallel rays of light converge to after passing through a lens.
In the case of a diverging lens, it is the point where parallel rays of light appear to diverge from after passing through the lens.
24
Q
Define the focal length of a lens.
A
The distance between the centre of the lens and the principal focus. (m)
25
What kind of focal length does a converging lens have?
A converging lens has a REAL principal focus so the focal length has a positive value.
26
What kind of focal length does a diverging lens have?
A diverging lens has a VIRTUAL principal focus so the focal length has a NEGATIVE value.
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Describe the image when the object is between F and the lens.
Image is further from the lens than the object but on the same side, virtual, magnified and upright.
## Footnote
(magnifying glass)
29
Describe the image when the object is at F.
Image is at F, real, diminished and inverted.
30
Describe the image when the object is between F and 2F.
Image is between F and 2F, real, diminished and inverted.
## Footnote
(camera or eye)
31
Describe the image when the object is at 2F.
Image is at 2F, real, same size as object and inverted.
32
Describe the image when the object is beyond 2F.
Image is beyond 2F, real, magnified and inverted.
## Footnote
(projector)
33
Describe the image when the object is at .
Virtual, upright and diminished.
34
Describe the image formed when using a DIVERGING lens.
Virtual, upright and diminished.
35
List the three ways to measure the focal length of a converging lens.
1. Approximate method using a distant object.
2. Using a plane mirror.
3. Measuring object and image distance.
36
What is the lens formula?
1/f = 1/u + 1/v
## Footnote
where f is the focal length, u is the distance between object and lens, v is the distance between lens and image (all in cm or all in m)
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