Seeing, Hearing, Feeling Flashcards
(14 cards)
Reflection
The bouncing of light off a surface.
Diffuse reflection
When light bounces off a rough surface in all directions, e.g: white card.
Regular reflection
When light bounces off a smooth surface in one direction, e.g: a mirror.
Plane mirror
A mirror designed to achieve a high level of regular reflection.
Refraction
As light travels from one medium to another, it changes direction. The bending of light as it passes from one medium to another is called refraction.
How can we see an object?
When light reflecting off an object passes into our eyes, we are able to see the object.
Pupil and Iris
When we look at an object, the light reflected from it travels through an opening in the eye called the pupil. The size of the pupil is controlled by the iris.
Cornea and Lens
The light is focused in the eye by the cornea and the lens.
Retina and the Optic Nerve
The fefracted rays of light form an image on the retina. This is a photosensitive layer f nerve cells at the back of the eye that sends impulses through the optic nerve to the brain.
White light is made up of the seven colours…
These colours are know as…
red, orange, yellow, green, blue, indigo and violet.
the spectrum of white light.
Dispersion
The splitting of white light into the seven colours that make it up. This can be seen using a prism.
Three primary colours, that when combined make white light.
Red, green and blue
Secondary colours
When two primary colours combine, they produce secondary colours, yellow, cyan and magenta.
All colours can be made from combining different quantities of the primary colours.
How objects absorb colour
Objects absorb all the colours in white light except their own colour, which they reflect.
White objects absorb none of the colours in white light.
Black objects absorb all of the colours and reflect no light.
