Done by "Mutaween alsaaib" group . school: Al-Arqam academy for girls. under supervision from Al-Bairaq

1. AL-Bairaq
I am Discovering Materials 13th Cycle
Manipulation of light in nanoworld
Mutaween alsaiib
Wadha Al-kuwari Muneera Al-Hajri
Aisha Al-Thani Afraa Al-Sulaiti

2. Outline:
– Background on Light.
– Activities :
• ACTIVITY 1: LIGHTS AND THEIR SPECTRUM.
• ACTIVITY 2: DIFFRACTION
– Part A: Diffraction in Water Waves.
– Part B :Diffraction Simulation.
– Part C: Diffraction of light through openings
• ACTIVITY 3: INTERFERENCE.
– Part A : Making Interference Transparent.
– Part B : Two Slit Simulation.
• ACTIVITY 4: OBSERVING IRIDESCENCE
– Part A: Nail Polish.
– Part B : Compact Disk.
– Part C: Peacock Feather.
– Part D: Soap Film
– Part E: Two Colors at Once
– Design project: LIGHT ON THE GO
– Product Idea.

3. Introduction:
• Light is defined as the electromagnetic
radiation with wavelengths between 380 and
750nm which is visible to the human eye.

4. Activity 1: light and their spectrum
• objective:
• to observe the spectrum of different sources
of light.
We cut the ‘clear’ CD Rom
and attach it to one end
of the paper-roll.
Then we add to the other
end, a black paper with a
slit, we added different
sizes for the slits.
After we add the source of
light the spectrum start
showing. (the colours that
the light contain)

5. Activity 1: light and their spectrum
• Results:
• Some light sources ( for example fluorescent light )
showed a discrete spectrum, while others (like
incandescent light) showed a continuous spectrum.

6. Activity 2: observing diffraction
part A: diffraction in water wave
• Objective:
1. Observe the diffraction of water waves as they pass through
a slit
2. Observe the effect of slit width on the diffracted waves
We used plastic box and wood stick to observe
The water wave and the size of the size and
The wideness of the waves.

7. Activity 2: observing diffraction
part A: diffraction in water wave
• Results:
• Diffraction was more clear when the size of the slit
was small

8. Activity 2: observing diffraction
part B: diffraction simulation
• Objective: to test the effect of the slit's width on the
resulting diffracted wave .
Results:
The most visible diffraction is when the size of the slit is smaller than or equal
to half the wavelength of light.

9. Activity 2: observing diffraction
part C: diffraction through an opening
• Objective: to see light diffracting from a small hole
(in a aluminium paper)
• Procedure: Results:
The diffracted light was
more clear and visible
when the size of the whole
was small.

10. Activity 3: observing interference
part A: Making interference transparent
• Objective : to observe constructive and destructive
interference using two transparent sheets .
• Procedure : we had a transparent sheets with 2
circles , we placed them over each other and we saw
the resulting waves .

11. Activity 3: observing interference
part B: two slits experiment
• Objective : to observe interference of one light .
• Procedure : the light waves pass through each slit , the
waves interfered as they travelled exactly the same
distance away from each slit .the results are the
formation of areas of darkness and areas of bright
light.

12. Activity 4: observing iridescence
• Objective:
• investigate the iridescence phenomena in
peacock feather , nail polish, CD
• And bubble soap
• Results:
• Iridescence may be due to the structural
features of the object itself or due to thin film
interference.

13. Why did we choose this product?
“light on the go “
• Many times we need the extra light , but we
are unable to hold a torch or put on more
light. “light on the go” is an attachable light
that you can use in dim places, or even
workers can used without the need to hold a
torch.

14. ‘LIGHT ON THE GO’
Materials and Method
• We used plastic frame and two lights, and
attach them together, to have an aadvanced
invention.

15. Results:
The plastic frame is light weighted
and cheap to buy and easy to attach
any thing to, because it stops the
electricity interference with the skin
and eyes.
We choose small light bulbs because we
want ‘LIGHT ON THE GO’ to be leigh
weighted and easier to attach to the
plastic frame.
“light on the go “ is now ready to
be used and even attached to any
glasses.

16. Conclusions
• Through our journey with Al-Bairaq, we learned a lot
and believed we can use this information to come up
with a new idea.
‘LIGHT ON THE GO’:
• will help a lot of people working in dim places.
• Its leigh weighted and easy to use.
• would change the hard time for night workers and all
people with limited vision.
• Even hunters can benefit from our product.

17. Acknowledgment ‫الشكر‬
Thanks to UNESCO, Qatar national commission, shell
and center of advanced materials, Qatar university.
we also thank our families for all the sport they gave
us,
And we thank our school for all the time they came
and made every thing easier.