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Science > Light And The Eye > Flashcards

Light And The Eye Flashcards

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1
Q

Angle of incidence

A

The angle an incoming Ray makes with the normal

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2
Q

Angle of reflection

A

The angle a reflected Ray makes with the normal

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3
Q

Diffuse reflection

A

Reflection of light in many directions from an uneven surface, such as a book or a backpack

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4
Q

Incident Ray

A

Incoming Ray

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5
Q

Law of reflection

A

i=r or the law stating that light is reflected at the same angle that it is incident

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6
Q

Normal

A

An imaginary line that is drawn at right angles to a surface that light is incident a
Upon

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7
Q

Plane mirror

A

A flat mirror

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8
Q

Refraction

A

The bending of light as it enters or leaves different substances

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9
Q

Refractive index

A

A measure of how easily light travels through a substance

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10
Q

Regular reflection

A

Reflection of light from a very smooth surface, such as still water or a mirror; it produces a clear image

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11
Q

Total internal reflection

A

When light is Completely reflected from the boundary of two substances; it occurs when the angle of incident is great than the critical angle

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12
Q

Critical angle

A

The angle of incidence of light that produces an angle of refraction of 90 degrees

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13
Q

Conduction

A

A method of heat transfer in which heat is passed by vibration of particles

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14
Q

Conductor

A

A substance that allows heat to flow through it

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15
Q

Insulator

A

A material that doesn’t conduct heat

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16
Q

Concave lens

A

Lens that curves inwards

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17
Q

Convex lens

A

A lens that bulges out wards

18
Q

Cornea

A

A transparent covering over the iris of the eye; it bends light into the lens

19
Q

Focal length

A

The distance from a lens to its focus

20
Q

Lens

A

In the eye it is a flexible structure that enables light to be focused on the retina

21
Q

Another name for long sightedness

A

Hyperopia

22
Q

Long sightedness

A

The inability to focus on close objects because the eyeball is too long

23
Q

Optic nerve

A

A nerve that carries an electrical signal from the retina to the brain

24
Q

Real image

A

An image formed when Ray’s of light do actually meet

25
Q

Retina

A

Nerve tissue at the back of the eye, consisting of cone cells and rod cells; light is converted into an electrical signal here

26
Q

Short sightedness

A

The inability to focus on distant objects because the eyeball is too short

27
Q

Accomodation

A

The ability of the lens of the eye to change its shape to adjust its focus

28
Q

Aqueous humour

A

Lies between the cornea and the lens .

It is a clear, watery fluid produced by the ciliary body to lubricate the lens and cornea

29
Q

Cornea

A

Bends light into the lens
Lies in front of the iris
Is clear

30
Q

Ciliary body

A

The lens is connected to the ciliary body

Muscles in the ciliary body change the shape of the lens

31
Q

Conjunctiva

A

A membrane that covers the sclera

32
Q

Choroid

A

Has a rich blood supply and nourishes the retina

33
Q

Sclera

A

White of the eye

34
Q

Cone cells and rod cells are

A

More concentrated in the fovea centralis - the sharpest vision

Rod cells are located in the retina

35
Q

Fovea centralis

A

Responsible for sharp central vision

36
Q

Eye muscles

A

Enable the eye to rotate in its socket

37
Q

Vitreous humour

A

Clear fluid between the lens and retina

38
Q

Dilator muscle

A

Enlarges the Pupil, allowing more light in the eye

39
Q

Sphincter muscle

A

Makes the pupil smaller, which stops light entering the eye

40
Q

Iris

A

The coloured part of the eye

It contains the dilator muscles and sphincter muscle as part of its structure

41
Q

Pupil

A

An opening in the iris that determines the amount of light entering the eye

Science (9 decks)

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