Science: Eye, Light, Colour Flashcards
What is a Convex Mirror?
When curved mirrors have a reflective surface that bulge outwards to the light-source. it has a large viewing point, makes the image smaller, and keeps the image upright. When parallel lines hit the mirror they reflect outwards and meet behind the mirror. that is the focus.
What is a Concave Mirror?
A Concave mirror has a reflective surface that is curved inward and away from the light source. It creates flipped images at the focal point and it makes images bigger. It has a small viewing area. When parallel lines hit the mirror they reflect inwards. At the point where they meet is called the focus.
Transparent
All the light goes through the object
Trasnluscent
Some light passes through
Opaque
No light passes through
Luminescence
Luminescence is the emission of light produced by methods other than heat
Chemiluminescence
Is the emission of light caused by a chemical reaction
Bio-luminescence
Organisms that emit light known as bio-luminescent organisms also produce light through chemical reaction
Law of reflection
The angle of a reflected ray of light is equal t the angel of the incident ray light
Phosphorescence
The ability of a material to absorb energy from an electromagnetic radiation such as a flashlight and continue to emit light after the source is removed
LED
It’s the most energy efficient, soft light, cheap to run expensive to buy can last about 14 years (25 000 hours)
CFL
Middle in efficient, brightness is same as LED, cost more than LED to run, cheap to buy, can last 8 000 hours
Incandescent
Non-efficient, soft light, cost a lot to sun cheap to buy. 750 hours
Shadow
Is it formed when light hits opaque object. The two regions the penumbra and umbra
Optics
Is the scientific study of the properties of light and the way technology uses it properties.
How does light travel?
Light travels in a straight line until it hits an opaque object. It is called rectilinear propagation. Light doesn’t bend opaque materials. We absorb the light.
The visible light spectrum
These colours of light for the visible light spectrum (red, orange, yellow, green, blue, violet.) These are the mixture of every colour.
Illuminessence
The amount of light arriving at one place per unit area.
Law of reflection
The reflected angel that comes out of an object that the ray came in.
Diffuse
When light hits a bumpy surface, it scatters.
Specular
When light hits a flat surface it comes out at the same.
Optics
The scientific study of the properties of light and the why technology uses it.
Luminescence intensity
How bright something is
Or = Oi
The reflected ray is the same angle as the incident ray.
Virtual vs Real
Virtual is what is behind the mirror and real is real.
Refraction
The bending of light
Defraction
The light going out
Simple concave lens
You look into the curved part. light goes outwards and makes the object smaller.
Double convex lens
lens has two bulging parts. the light slows inside the lens. the object is SUPER big. light goes inwards.
Simple convex lens
you look through the bulging part. the light slows inside the lens. the object is bigger, light goes inwards.
Double concave lens
both sides curve inwards but the light goes outwards. objects look smaller.
Human eye - iris
The coloured part of the eye. controls the amount of light allowed into the eye.
Human eye - pupil
Allows the light into your eye.
Human eye - cornea
The outer protective of the eye
Human eye - retina
Located at the back of the eye filled with specialised cells. When the light enters the eye it must hit them retina in order to be a healthy eye.
Human eye - vitreous humor
maintains the shape of the eye with it’s jelly like substance.
Human eye - cillian muscle
Located next to the iris. controls the iris movement in order to help with pupil dilation.
Human eye - aqueous humor
Holds a watery like substance infront of the pupil and iris.
Human eye - lens
This is a convex lens located right behind the pupil. When light enters into the eye it refracts the light inwards so it can hit the retina.
Light rays in the eye
When light hits your eye there are many rays. The rays that hit the iris reflect outwards. The rays that hit the pupil go into the eye
Pupil dilation
When there is less light your pupil is bigger and when there is more light your pupil is smaller.
Retina and electricity
Retina turn light into electricity for your brain.
Human eye - obtic nerves
Obtic nerves are located close to your retina. once the retina detects what the image is the obtic nerves send it to your brain.
