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Science > Light > Flashcards

Light Flashcards

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Biology 101 flashcards
1
Q

Light

A

light is electromagnetic radiation that is visible to the human eye

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2
Q

Reflection

A

A reflection is an image that is reflected in a mirror. Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated.

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3
Q

Rays

A

Straight lines in which light may seem to stream from the sun or any luminous body.

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4
Q

The normal

A

The virtual straight line that sits perpendicular on a plane

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5
Q

Incidence ray

A

The incident ray is the ray that strikes a surface.

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6
Q

Reflection ray

A

The reflected ray is the ray that is reflected from a surface.

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7
Q

Luminous

A

A light source that makes its own light

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8
Q

Non-luminous

A

A light source that is luminous due to another light source

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9
Q

umbra

A

The part of a shadow that is the innermost and darkest part of a shadow.

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10
Q

penumbra

A

The part of a shadow that is outermost and lightest.

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11
Q

shadow

A

shadows are where light doesn’t reach due to an opaque object blocking its way.

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12
Q

wavelength

A

The distance between two crests

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13
Q

electromagnetic spectrum

A

A spectrum that is made of a range of frequencies from electromagnetic radiation and their respective wavelengths.

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14
Q

Trough

A

The dip or bottom point in a wave

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15
Q

transverse waves

A

A wave that moves in right-angles to the direction it’s travelling

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16
Q

longitudinal waves

A

A wave vibrating towards the direction it’s going.

17
Q

frequency

A

The frequency of a light wave is the number of crests that pass a certain point in one second.

18
Q

medium

A

A substance which as its own properties.

19
Q

crest

A

The point in the wave that is highest and on top.

20
Q

equilibrium

A

The solid line in the middle of a wave that determines the amplitude

21
Q

amplitude

A

The distance between the equilibrium and the crest or trough.

22
Q

Iris

A

Ring of Muscle that controls the amount of light that enters the eye, it changes the size and diameter of the pupil.

-Controls the size of the pupil.

23
Q

Lens

A

The lens is a clear jelly-like substance and focuses light onto the retina.

-Focuses light onto the retina.

24
Q

Cornea

A

Transparent Layer of skin that helps focus your vision, which is like glass.

-Protects the front of the eye

25
Q

Vitreous Humour/Body

A

The vitreous humour is a jelly-like substance in the middle of the eye that helps it keep its shape.

26
Q

Optic Nerve

A

Sends and carries the electrical message that contains the image to the brain

-Receives signals from the retina and sends them to the brain.

27
Q

Rods

A

Photoreceptors in the retina that detect brightness light, shapes and movement- The majority of photoreceptors are rods

28
Q

Cones

A

Photoreceptors in the retina that detect colour, does not do well without light.

29
Q

Aqueous Humour/Body

A

The aqueous humour is a watery liquid that helps distribute nutrients to the cornea and lens. This is important, since the cornea and lens have no blood vessels, and blood vessels are how most tissues receive nutrients.-

-Brings nutrients to the cornea and lens, which lack blood vessels.

30
Q

Pupil

A

Is the black hole in the middle of your eyes, its main function is to allow light into the eye.

-Allows light into the eye

31
Q

Retina

A

The retina is the tissue lining the back of the eye and is where all the photoreceptors (sensory receptors of the eye) are located. The photoreceptors allow the retina to detect light. It coverts the light into an electrical message for the brain.

-Detects light using cells called photoreceptors.

32
Q

Sclera

A

The sclera is a thick, tough layer that surrounds most of the eye. It helps the eye maintain its shape and serves as an attachment point for muscles that move the eye.

-Protects the eye and helps it maintain its shape.

33
Q

Refraction

A

Refraction is where light passes from one substance into another substance with different densities, changing its direction.

34
Q

Tapetum

A

Reflective blue-green part at back of eye, used to see in dark.

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