P3 brainscape facts Flashcards by andrew gill | Brainscape

Q

Cornea

A

refracts light - bends it as it enters the eye

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Q

Iris

A

controls how much light enters the pupil

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Q

Pupil

A

The aperture (hole) in the eyeball which light passes through

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Q

Lens

A

focuses light onto the retina

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Q

Retina

A

contains the light receptors

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Q

Long sighted

A

Caused by Eyeball not being round ie too short

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Q

Long Sighted

A

Caused by the lens not bending rays of light enough

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Q

Short Sighted

A

Caused by Eyeball not being round ie too long

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Q

Short Sighted

A

Caused by the lens bending rays of light too much

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Q

Short Sighted

A

Image is formed before retina

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Q

Long sighted

A

Image is formed after retina

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Q

Higher refractive index

A

Causes more refraction (bending) of light

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Q

Cillary Muscles

A

Contract or relax to change the shape of the lens

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Q

Convex lenses

A

Converge rays of light

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Q

Concave lenses

A

Diverge rays of light

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Q

Virtual image

A

Formed on same side of lens as the object

Q

Virtual image

A

Cannot be projected onto a screen