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As Physics > 2.3 Lenses > Flashcards

2.3 Lenses Flashcards

1
Q

What are the properties of an image formed by a diverging lens

A

Virtual
Upright
Diminished

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2
Q

Properties of the image formed by converging lens beyond 2F and example

A

Inverted
diminished
Real

Eye

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3
Q

Properties of the image formed by converging lens at 2F

A

Real
same size
inverted

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4
Q

Properties of image formed between 2F and F and example

A

Real
Inverted
Enlarged

Projector

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5
Q

Properties of image formed at F

A

No image formed

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6
Q

Properties of image formed between F and optical centre and example

A

Virtual
enlarged
Upright

Magnifying glass

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7
Q

Lens equation

A

1/F = 1/u + 1/v

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8
Q

For a converging lens is F positive or negative
For a diverging lens …

A
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9
Q

For a real image is v (image distance) + or -
For a virtual image …

A
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10
Q

Is u (object distance) always + or -

A

+

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11
Q

What does a graph of 1/v against 1/u look like for a converging lens

A

Constant slope down

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12
Q

Define focal length

A

Distance from Focal point to optical centre

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13
Q

Define principal focus

A

Point on principal axis that parallel rays of light converge or appear to diverge from after refraction

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14
Q

2 equations for magnification m

A

m = hi/ho
m = v/u

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15
Q

Which lens corrects myopia? Hypermetropia?

A

Diverging
Converging

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16
Q

Equation for power of a lens

A

p = 1/f

f = focal length

17
Q

In a calculation for correcting hypermetropia, what value of u and v are used? Will f be + or -? Why?

A

u = 0.25
v = original np (- because image is virtual)

+ because converging lens is used

18
Q

In a calculation for correcting myopia, what values of u and v are used? Will f come out + or -?why?

A

u = infinity
v = original fp (-)

  • because diverging lens is used
19
Q

Distinguish between a real and a virtual image

A

Real image is formed by 2 or more real rays of light
Virtual images are formed by both real and virtual rays of light

As Physics (18 decks)

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