LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.
-
Upload
kristopher-bucher -
Category
Documents
-
view
230 -
download
0
Transcript of LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.
![Page 1: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/1.jpg)
LIGHT !from bonfires to lasers
![Page 2: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/2.jpg)
2
Sources of light
Hot objects give out light.
A bonfire
![Page 3: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/3.jpg)
3
The Sun Sunset in Venice
![Page 4: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/4.jpg)
4
Stars
Stars and galaxies give out light.
Picture: Liverpool Telescope
![Page 5: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/5.jpg)
5
Lightning
![Page 6: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/6.jpg)
6
A worm living in dark caves sends out light from its tail.
Liquid droplets form a string of shining beads to attract insects.
tail of worm
![Page 7: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/7.jpg)
7
Some cold things give out light:
some fungi glow worms light sticks LEDs ‘glow-in-the-dark’
stickers
![Page 8: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/8.jpg)
8
How do we see light sources?
Light travels from a source to our eyes.
We can see sources in a dark room.
![Page 9: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/9.jpg)
9
Can we see in the dark?
If there is no light we cannot see anything!
Let’s try a test– Put a few small objects into the black
bag-----
![Page 10: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/10.jpg)
10
How do we see things that are not sources of light?
Light bounces off and some reaches our eyes.
![Page 11: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/11.jpg)
11
On the look out ! How do you
know that the baby squirrel watches as it feeds?
![Page 12: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/12.jpg)
12
Reflection
When light bounces off something we say the light is reflected.
We can try this with rough surfaces and shiny surfaces.
![Page 13: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/13.jpg)
13
![Page 14: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/14.jpg)
14
Shiny surfaces
Light is reflected as a beam and can be seen on the wall.
wall
mirror
![Page 15: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/15.jpg)
15
Move the mirror
The light reaches a different place on the wall.
wall
![Page 16: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/16.jpg)
16
Look in a mirror Light is reflected.
You can see a reflection.
![Page 17: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/17.jpg)
17
Change the direction of the light beam Light is still reflected.
You see a reflection - in a different
direction.
![Page 18: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/18.jpg)
18
Multiple reflections The lamp hangs
between two large mirrors on opposite walls.
The reflection in the first mirror is reflected in the second mirror, which is reflected again in the first mirror - - -
![Page 19: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/19.jpg)
19
Now for some games !
![Page 20: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/20.jpg)
20
Colour
![Page 21: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/21.jpg)
21
Sunlight shining on CDs Where do the
colours come from?
![Page 22: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/22.jpg)
22
Rainbow
redorang
eyellow green blue indigoviolet
![Page 23: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/23.jpg)
23
Colours
White light is made up of lots of colours
![Page 24: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/24.jpg)
24
Colours from white light Look at a lamp
through the grating.
You will see colours.
![Page 25: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/25.jpg)
25
red
![Page 26: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/26.jpg)
26
![Page 27: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/27.jpg)
27
blue
![Page 28: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/28.jpg)
28
Adding colours with light
This is different to adding paints
![Page 29: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/29.jpg)
29
Red + Blue magenta
![Page 30: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/30.jpg)
30
Blue + Green cyan
![Page 31: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/31.jpg)
31
Green + Red yellow
![Page 32: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/32.jpg)
32
![Page 33: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/33.jpg)
33
yellow
![Page 34: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/34.jpg)
34
magenta
![Page 35: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/35.jpg)
35
cyan
![Page 36: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/36.jpg)
36
Fairy lights
![Page 37: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/37.jpg)
37
Uses
Lasers- produce very bright beams of light.The atoms all give out their light
together
CDs use laser light and reflection-
![Page 38: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/38.jpg)
38
CDs
The surface has tiny pits and smooth bits in a spiral pattern
the pits scatter light from a laser the smooth bits reflect the light so a coded message is read.
spiral
![Page 39: LIGHT ! from bonfires to lasers. 2 Sources of light Hot objects give out light. A bonfire.](https://reader036.fdocuments.us/reader036/viewer/2022081422/551a9e3c55034643688b62e6/html5/thumbnails/39.jpg)
39
Laser show
Physics is in everything