light and the eye science year 9!

this is for test term 3 week 3 year 9

what kind of energy is light

light is a form of radiant energy specifically electromagnetic energy that travels through waves

diffuse reflection

no image is formed also known as glare

regular reflection

forms an image

law of reflection

states that the angle of incidence and the angle of reflection are equal to each otherThis principle applies when light reflects off a smooth surface, maintaining the same angle relative to the normal.

law of refraction

states when light travels from one medium into another at an angle, it bends

light and water

when light enters water it bends towards the normal

convex

makes light rays bend inwards from the original path

concave

makes light rays bend outwards from their original path

cornea

transparent outer covering of the eye

pupil

circular black area in the centre of the eye through which light enters

iris

coloured circular part of the eye surrounding the pupil

vitress humour

clear jelly like substance through which light passes

choroid

layer of blood vessels that supply the retina

ciliary muscle

muscle that controls the focus of the lengs by chaning its shape

sclera

white outer layer

lens

small disc of transparent tissue behind the pupil allowing the eye to focus on near and far objects

fovea

small part of the retina containing light sensitive cells

retina

area of tissue at the back of the eye containing cells that detect light and colour

optic nerve

the nerve that connects the eye to the brain

blindspot

the area in your vision where the optic nerve exits the eye

plane mirror properties

image is upright and appears to be behind the mirror

convex mirror properties

image shows wider field of view and is upright and the objects appear smaller

concave mirror properties

images are magnified and can be upside down

plane mirror up close

clear

plane mirror elbows length away

the image is even spaced and clear

plane mirror arms length away

cant see very well

concave up close

the image is magnified

concave elbow length away

blurry and inverted

concave arms length away

kind of distorted

convex up close

image shows a large surface area

convex elbows length away

image is elongated

convex arms length away

shows a much larger field of view

objects in water

Objects in water appear closer to the surface because the refraction of light. light bends slowly in water and the light rays bend away from the normal

transverse wave

a wave in which the particle vibrate or move at right angles to which the direction of energy transfers

frequency

the number of cycles of a wave per second

wavelength

the distance form one wave to the next

amplitude

the distance of a wave crest or the depth of a wave trough from the centre line of the wave

transverse wave

image hitting rough surface

law of refleciton diagram

concave mirror diagram

convex mirror diagram

light rays in water vs air

the eye

images