Light

Question 1

Light

Answer 1

light is electromagnetic radiation that is visible to the human eye

Question 2

Reflection

Answer 2

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.

Question 3

Rays

Answer 3

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

Question 4

The normal

Answer 4

The virtual straight line that sits perpendicular on a plane

Question 5

Incidence ray

Answer 5

The incident ray is the ray that strikes a surface.

Question 6

Reflection ray

Answer 6

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

Question 7

Luminous

Answer 7

A light source that makes its own light

Question 8

Non-luminous

Answer 8

A light source that is luminous due to another light source

Question 9

umbra

Answer 9

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

Question 10

penumbra

Answer 10

The part of a shadow that is outermost and lightest.

Question 11

shadow

Answer 11

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

Question 12

wavelength

Answer 12

The distance between two crests

Question 13

electromagnetic spectrum

Answer 13

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

Question 14

Trough

Answer 14

The dip or bottom point in a wave

Question 15

transverse waves

Answer 15

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

Question 16

longitudinal waves

Answer 16

A wave vibrating towards the direction it’s going.

Question 17

frequency

Answer 17

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

Question 18

medium

Answer 18

A substance which as its own properties.

Question 19

crest

Answer 19

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

Question 20

equilibrium

Answer 20

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

Question 21

amplitude

Answer 21

The distance between the equilibrium and the crest or trough.

Question 22

Iris

Answer 22

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.

Question 23

Lens

Answer 23

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

-Focuses light onto the retina.

Question 24

Cornea

Answer 24

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

-Protects the front of the eye

Question 25

Vitreous Humour/Body

Answer 25

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

Question 26

Optic Nerve

Answer 26

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

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

Question 27

Rods

Answer 27

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

Question 28

Cones

Answer 28

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

Question 29

Aqueous Humour/Body

Answer 29

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.

Question 30

Pupil

Answer 30

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

Question 31

Retina

Answer 31

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.

Question 32

Sclera

Answer 32

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.

Question 33

Refraction

Answer 33

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

Question 34

Tapetum

Answer 34

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