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Grade 8: Science > Unit C: 4.0 > Flashcards

Unit C: 4.0 Flashcards

1
Q

What is the function of the cornea?

A

Protect all the sensitive parts of the eye

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2
Q

What is the function of the iris?

A

To control the size of the pupil

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3
Q

What is the function of the pupil?

A

To let in more or less light

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4
Q

What is the function of the ciliary muscle?

A

To make the lens thicker or thinner

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5
Q

What is the function of the lens?

A

To focus the light onto the retina

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6
Q

What is the purpose of the retina?

A

To send the image to the optic nerve

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7
Q

What is the function of the optic nerve?

A

To send the image to the brain

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8
Q

What does it mean when the pupil dilates?

A

Becomes bigger

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9
Q

Which part of the camera is like the retina?

A

The film

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10
Q

What part of the camera is like the iris?

A

The diaphragm

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11
Q

What part of the camera is like the eyelid?

A

The shutter

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12
Q

What part of the camera is like the lens?

A

The lens!

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13
Q

What part of the camera is like the pupil?

A

The aperture

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14
Q

What is the retina?

A

It is the sensitive layer that like strikes. It is filled with photo receptors

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15
Q

What are rods sensitive to?

A

Light

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16
Q

What are cones sensitive to?

A

Color

17
Q

Why can’t you see colors in the dark?

A

Because comes don’t work very well in low light

18
Q

What happen when light strikes the retina?

A

The photoreceptors send light to the optic nerve

19
Q

What is farsightedness?

A

When the light doesn’t focus early enough

20
Q

What is nearsightedness?

A

When the light focuses to early

21
Q

How is farsightedness corrected?

A

It is fixed with convex lenses

22
Q

How is nearsightedness corrected?

A

It is fixed with concave lenses

23
Q

How does laser eye surgery work?

A

The surgeon uses a laser to reshape the cornea

24
Q

How do night vision goggles work?

A

Light goes through light intensifiers and then through a phosphor screen which causes them to glow green

25
Q

What are the parts of the eye?

A 
Cornea
Iris
Pupil
Lens
Ciliary muscle
Retina
Optic nerve

Grade 8: Science (18 decks)

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