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AQA GCSE - Physics > 3.1 (P2) Lenses And Eye > Flashcards

3.1 (P2) Lenses And Eye Flashcards

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1
Q

What are the two types of lenses?

A

Converging (convex)

Diverging (concave)

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2
Q

What do converging lenses do?

A

Causes parallel light rays to converge to a point

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3
Q

What does a diverging lens do?

A

Causes parallel light rays to diverge from a point (spread out)

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4
Q

Difference between image and object?

A

You start with the object

You create the image

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5
Q

What lens is used in camera/eye?

A

Converging/convex

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7
Q

What is the outcome of the image in camera/eye?

A

Real
Inverted
Diminished

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8
Q

Does the image end up on the same or opposite side of the object in camera/eye?

A

Opposite side

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9
Q

What lens is used in a projector?

A

Converging/convex

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10
Q

Where does the object have to be for projector?

A

Closer than twice the focal point

Further than the focal point

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11
Q

What is the outcome of the image in projector?

A

Real
Inverted
Enlarged

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12
Q

Does the image end up on the same or opposite side of the object in projector?

A

Opposite side

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13
Q

What lens is used in a magnifying glass?

A

Converging/convex

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14
Q

Where does the object have to be for a magnifying glass?

A

Closer than the focal point

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15
Q

What is the outcome of the image in a magnifying glass?

A

Virtual
Upright
Enlarged

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16
Q

Does the image end up on the same or opposite side of the object in a magnifying glass?

A

Same side

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17
Q

Where does the object have to be for a diverging lens?

A

Further than the focal point

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18
Q

What is the outcome of the image in a diverging lens?

A

Virtual
Upright
Diminished

19
Q

Does the image end up on the same or opposite side of the object in a diverging lens?

A

Same side

20
Q

What is a real image?

A

Where light rays converge

21
Q

What is a virtual image?

A

Where virtual light rays converge or where light rays appear to converge

22
Q

In the eye what is the function of the blindspot?

A

Where the retina is not sensitive to light

23
Q

In the eye what is the function of the ciliary muscle?

A

Changes the thickness of the eye lens

24
Q

In the eye what is the function of the cornea?

A

Transparent layer that protects the eye

Helps focus the light on to the retina

25
Q

In the eye what is the function of the iris?

A

Ring of muscle that controls the amount of light entering

26
Q

In the eye what is the function of the lens?

A

Focuses the light on to the retina

27
Q

In the eye what is the function of the optic nerve?

A

Carries nerve impulses from the retina to the brain

28
Q

In the eye what is the function of the pupil?

A

Hole formed by the iris allowing light rays through

29
Q

In the eye what is the function of the retina?

A

Light sensitive cells receive light rays and convert them into neural signals

30
Q

What is the power of a lens?

A

It’s ability to bend light

31
Q

The greater the power…

A

The greater the refraction of light

32
Q

What is power of a lens measured in?

A

Dioptre - singular

Diopters - plural

33
Q

What is the power of a converging lens?

A

Positive

34
Q

What is the power of a diverging lens?

A

Negative

35
Q

Where does the object have to be for camera/eye?

A

More than 2F (twice focal point) away

37
Q

What is focal length measured in?

A

Meters

38
Q

What lens corrects short sightedness (myopia)? Why?

A

Diverging

The light rays previously converged before the retina

39
Q

What lens corrects long sightedness (hyperopia)?

A

Converging

The light rays previously converged beyond the retina

40
Q

What is focal length determined by?

A

Refractive index of the material of a lens

The curvature of two surfaces of the lens

41
Q

For a given focal length:
The greater the refractive index…

Meaning…

A

The flatter the lens

The lens can be manufactured thinner

42
Q

What is the eyes range of vision?

A

25cm to infinity

Depends on each person

43
Q

What are the two equivalents in a camera and the eye?

A

Retina and CCD’s

AQA GCSE - Physics (16 decks)

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