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photography and science

h bm hjt
by

Iwan Richards

on 19 August 2013

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Transcript of photography and science

And Science
Photography
Uses
Photography is used in science for a lot of reasons: To enlarge
To Shrink
To see in slow
motion
Or speed up
To see farther than the human eye
To see in places we can't
To see things we can't see
To see in ways we can't see like infra-red
Luminous, opaque and
transparent
Reflection and refraction
Reflection
Luminous objects are what provide us with light without them there would be no light anywhere.
The sun is luminous.

Transparent objects allow light to pass through them. Glass is transparent.

Opaque objects don't give off light or let it pass through. Most things are opaque.
Cameras
Light from the sun is emitted and some of the light hits the moon and is reflected off, some of the light then reaches your eye. The beam of light is reflected out at the same angle as it hits the normal (a line sticking directly out from the surface reflecting the light)
Refraction
Light from the sun hits the lens in the magnifying glass, the lens causes the light to slow down & change angle slightly, focusing into one beam.
Pinhole cameras
Note: light always travels in straight lines
The aperture slides open or closed to alow more or less light
Lenses refract light, widening or closing the gap zooms in or out
This mirror stays in the set position to allow you to use the view finder (view system in this case) when you take the photo the mirror flips down and the shutter (a cover that protects the sensors) opens to allow the picture to be taken.
Normal
Light
Mirror
There are also lenses in the human eye
The image formed in a pinhole camera is always upside down to start with, this is because light enters the camera at an angle and is projected like shown in the pictures.
Colour
We see colour the way we do because colour is how light is made up. All the colours of the rainbow together make white light and are always there. Black is the absence of colour.
Objects that are coloured (as opposed to pitch black or completely reflective) reflect the frequency of light that produces the colour they are.
The object absorbes all other colours of light, if the colour of the light doesn't fit the object then nothing is reflected and the object will be black, or if the object is the only thing to reflect the colour of light every thing else will appear black.
These don't work
The pin hole size affects the quality of the picture
Large hole
Small hole
We use cameras and take them for granted. They capture a moment and use complex systems hard to believe.
In fact cameras are so far ahead of us that they can see things we can't. Infra red is a frequency just below red light (hence the name) and is a type of energy given of by anything with heat, the sun, us, the computer, it all gives of some sort of infra red light as heat.
Thank you for watching and enjoy your day at The Mrs. Dolan's Classroom Science Museum
By Iwan Richards
We have cameras that see infra red a screen covered in blues, yellows, reds.
Full transcript