P11: Lenses and The Eye Flashcards

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1
Q
A

Concave (Diverging) Lens

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2
Q
A

Concave (Converging) Lens

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3
Q

Uses of a convex lens

A

Magnifying Glass, In a camera to create a clear image of a far off object.

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4
Q

Uses of a concave lens

A

To correct short sightedness.

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5
Q

Focal Length

A

The distance from the centre of a lens to where the light rays focus (or, in the case of a concave lens, appear to diverge from.)

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6
Q
A

Real Image, from a convex lens.

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7
Q
A

Virtual Image, from a concabe lens

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8
Q

Magnification of an image =

A

Image height/ Object Height

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9
Q

How to construct a real image/converging lens diagram

A
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10
Q

How to construct a virtual/Converging lens diagram

A
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11
Q

How to construct a virtual/Diverging lens diagram

A
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12
Q

How does a camera work?

A
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13
Q

What does ‘real is positive’ mean?

A

Real images are given positive focal lengths in the formula, virtual negative.

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14
Q

1/focal length =

A

1/distance from object to lens + 1/distance from lens to image

(1/u + 1/v = 1/f)

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15
Q

A diverging lens…

A

… always gives a virtual image.

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16
Q
A
17
Q

Iris

A

Coloured ring of muscle that controls the amount of light entering the eye.

18
Q

Aqueous Humour

A

Transparent watery liquid that supports the front part of the eye.

19
Q

Cornea

A

Transparent layer that protects the eye and helps to focus light onto the retina.

20
Q

Pupil

A

the central hole formed by the Iris. Light enters the eye through the pupil.

21
Q

Ciliary Muscles

A

Attached to the lens by Suspensory Ligaments.The muscles change the thickness of the eye lens.

22
Q

Eye Muscles

A

Move the eye in the socket.

23
Q

Optic Nerve

A

Carries nerve impulese from the retina to the brain.

24
Q

Blind Spot

A

Region of the retina that is not sensitive to light (no light sensitive cells present)

25
Q

Retina

A

The light sensitive cells around the inside of the eye.

26
Q

Vitreous Humour

A

Transparent jelly-like substance that supports the back of the eye.

27
Q

Eye Lens

A

Focuses light onto the retina.

28
Q

Type of lens (Eye vs Camera)

A

Variable focus converging lens

Fixed focus convergin lens

29
Q

Focusing Adjustment (Eye vs Camera)

A

Ciliary muscles adjust lens position.

Manual adjustment of lens position.

30
Q

Image produced (Eye vs Camera)

A

Both real, inverted, magnification less than 1.

31
Q

Image detection (Eye vs Camera)

A

Light sensitive cells on the retina

Photographic Film (or CCD sensors in digital camera)

32
Q

Brightness Control (Eye vs Camera)

A

Iris controls width of pupil

Adjustment of aperture ‘stop’

33
Q

Short Sight

A

An eye that can only focus on near objects.

Corrected with a diverging lens.

34
Q

Long Sight

A

An eye that can only see far away objects.

Corrected with a converging lens.

35
Q

Power of a lens (D (dioptre)) =

A

1/ focal length (m)

36
Q

The higher the refractive index of a lens material…

A

… The flatter and thinner the lens can be.

37
Q
A