Victoria School LSS TFU: Focus Point..

A little video we made for our Physics TFU Project. It's all about trying to burn an object using Reflection and Refraction.

Group Members:
Isaac Tay,
Low Qi Xun,
Abdul Aziz,
Li Ming Ren.

Script:
How to burn an object using the concept of refraction or by reflection light rays from the sun.
Based on the myth of the Archimedes death ray.
These are the apparatus we are using.
An empty can of soda.
Metal polish
Now Start polishing the bottom of the can to make it mirror-like.
Now we head outdoors at midday, around 12noon to 2 pm, when the sun is bright and strong.
Find the focal point by moving the leaf up and down slowly.
Smoke Watch caaaarefully.

How does it work? The bottom of the can serves as a parabolic concave mirror which reflects and converges the suns rays onto the focal point. This concentrates the heat of the sun. This can be seen in the diagram, where we have traced the suns rays as they travel and are reflected by the concave mirror which is the soda can, to converge onto a point.

Refraction
These are the apparatus we are using.
Find the focal point.
Now, wait as the point of concentrated suns rays burn the leaf.
Check it out in Fast forward.

How it works. The convex lens of the magnifying glass will focus the suns rays on to a point. This concentration produces a point source of heat, similar to the experiment using the soda can. This heat can burn a hole in the leaf. The magnifying glass can converge the suns rays because of the convex lens and the refraction of the suns rays as it travels from air to glass and back to air again. Focusing the suns rays intensifies the heat at the point to burn through the leaf.

Thanks!

Category:

Science & Technology

Tags:

• victoria
• lss
• tfu
• physics
• project
• video
• burn
• fire
• smoke
• metal
• polish
• can
• magnifying
• glass
• matchsticks
• sunlight
• science
• focus
• point

[ROBwithaB]

Sorry to be critical here, but the whole point of scientific knowledge is to propose theories after experimentation and then submit them for review, so:

1. You are substantially blocking the incoming rays of the sun by holding the leaf in front of your mirror.

2. Unless you are at or near the equator, you wouldn't want the tin to be on a horizontal surface. The tine should be facing the sun directly.

3. A leaf is not a particularly effective target.

Search for

101 Ways to Make Fire Beer Can

[invinciblemode]

@ROBwithaB Thanks for your comment dude..

We are aware of the mistakes; it was all we could do in a short time..

P.S. We ARE on the equator..

[ROBwithaB]

@invinciblemode

Cool. Being able to admit mistakes is the first step on the road to knowledge. Perhaps you could post a revided version ?

I'm guessing Singapore, then?

[invinciblemode]

@ROBwithaB yeah..we're from Singapore..

nahh..i dun think i'll be making a revised version..as u can see we made this video last year for our science project..

[georasken]

argh!!! global warming!!! kidding. dang! give me that metal polisher :)

[invinciblemode]

u want the polish?

[Joe987546]

cool

[megaclawer]

Global warming for reflection? WOW WOW

[megaclawer]

OOOOO I love it

[r2d2121195]

nice aziz