Light and optics unit

Natural Light Source

The sun

Artificial Light

flashlight

Incandescence

Light bulb

Fluorescence

ultraviolet light

Phosphorescent

glow in dark stars

Chemiluminescence

Glow stick

Bioluminescence

firefly

absorbed

When light is absorbed it, doesn’t pass through the object

transmitted

When light is transmitted it goes through the object

reflected

light bounces off the object

transparent object

a window, this is where light passes through

translucent object

tissue paper, where light sort of passes through

opaque object

a desk because light is absorbed and doesn’t pass through

law of reflection

The angle of incidence is equal to the angle of reflection

Concave Mirror

Images appear larger used for upside down view

Convex Mirror

Images appear smaller and used for bigger view

real vs. virtual image

Real image is where light converges and virtual is where light diverges

why refraction occurs when light moves from air to water

because air is a less dense medium, so when it goes to a denser substance, it bends because it moves slower when going in

Optic nerve

electric signals from eye to brain

Retina

tissue where image is formed

Sclera

white part of eye that maintains eye shape

Ciliary muscle

focusing the eye

Lens

changes direction of light

Iris

the colored part that controls amount of light going in the eye

Pupil

opening where light enters

cornea

it helps focus light

cones

see color

rods

outlines/shapes

aqueous humor

Provides nutrition to eye

virtuous humor

Helps maintain the shape of the eye

the film

retina because image focuses in the eye

the diaphragm

iris because it controls the pupil and how much light enters

the aperture

the pupil because it can adjust itself

the lens

the lens because it focuses light

blind spot

no light sensitive cells so you can’t see from there

hyperopia

eye is too long so you can’t see close up

Myopia

eyes are squished so you can’t see far away

lens is used to correct myopia

the correct lens to use for myopia is a concave lens

lens used to correct hyperopia

The correct lens for hyperopia is convex

lens vs. mirror

lens is when light can pass through and a mirror is when light reflects or bounces off of that surface

optical technology examples

VR - This helps treat lazy eye by making both eyes work by focusing on a certain thing

Glasses - This helps treat people with poor vision because when using certain lenses, the light will be directed in a certain way that helps your eye

Laser eye surgery - This helps treat poor vision by taking out the corneal tissue to fix it a bit and put it back in the eye to improve it