How does a matchstick be lite up with a magnifying glass?

Firstly, let me introduce to you of what is a magnifying glass. A magnifying glass is a convex lens which is used to produce a magnified image of an object.





How does it work? It works by creating a virtual magnified image of an object behind the lens.









Well, referring to today's post: How does a matchstick be lite up with a magnifying glass?


According to my researches on the Internet, I have found some appropriate answers for today's post!

By focusing the rays of the Sun on a pile of dry leaves, grass or grass roots, a fire can be started.




www.youtube.com/watchv=TiKM4TVTmjU&feature=player_embedded :-)

Credits to www.google.com ;

http://images.google.com.sg/imglanding?q=how%20do%20mirrors%20produce%20funny%20images?&imgurl=http://barcelona.theoffside.com/files/2008/05/glass_half_empty1.jpg&imgrefurl=http://learningfromlynn.blogspot.com/2009_03_01_archive.html&usg=__HZ0DeLhLRJ2vHogXGTbBVokqHJU=&h=341&w=350&sz=13&hl=en&um=1&itbs=1&tbnid=Lmj8xsdOlKeARM:&tbnh=117&tbnw=120&prev=/images%3Fq%3Dhow%2Bdo%2Bmirrors%2Bproduce%2Bfunny%2Bimages%253F%26start%3D21%26um%3D1%26hl%3Den%26sa%3DN%26rlz%3D1R2ACAW_enSG374%26ndsp%3D21%26tbs%3Disch:1&start=21&um=1&sa=N&rlz=1R2ACAW_enSG374&ndsp=21&tbs=isch:1#tbnid=Lmj8xsdOlKeARM&start=25

http://images.google.com.sg/imglanding?q=how%20do%20mirrors%20produce%20funny%20images?&imgurl=http://open.salon.com/files/inverted_mirror1249731993.jpg&imgrefurl=http://open.salon.com/blog/galaxyman/2009/08/08/you_didnt_invent_this_did_you&usg=__yuSbNsoSXRIGHqQcrM98wb-83f4=&h=286&w=250&sz=15&hl=en&um=1&itbs=1&tbnid=7SklCy-b2TA_iM:&tbnh=115&tbnw=101&prev=/images%3Fq%3Dhow%2Bdo%2Bmirrors%2Bproduce%2Bfunny%2Bimages%253F%26um%3D1%26hl%3Den%26sa%3DN%26rlz%3D1R2ACAW_enSG374%26tbs%3Disch:1&um=1&sa=N&rlz=1R2ACAW_enSG374&tbs=isch:1&start=13#tbnid=7SklCy-b2TA_iM&start=17










1) How many images an object would have if you place it between two mirrors placed at an angle less than 90 degrees?
Three. The number of images form depends on the angle the mirrors form. As you make the angle between the mirrors smaller, you will see more images form. The light bounces back and forth more times, and you see more images form on the mirror.





2) What happens to the image of the angle is bigger than 90 degrees?


3) How do mirrors produce funny images?
There are three types of mirrors- plane, convex and concave mirrors. The mirrors are invented to bent in different angles so that when light is reflected to the mirrors, it is reflected in different directions. Hence, it results in different shapes and sizes of the people when they see themselves in the mirror.

Chemistry Register 19

1. Microwaved food is believed to contain microwaves. How safe is microwaved food?

In my opinion, microwaved food is safe to be consumed. People have been using microwave ovens as a way to cook their food and nobody has gotten sick from eating microwaved food yet. It is safe, however it is only unhealthy due to the amount of sugar and/or salt they put into the food to keep it fresh enough to be eaten even after being microwaved. Microwaving food is somehow good; it can kills alot of toxins in the food, without killing the nutrients (eg; such as in vegetables when they are over-cooked). Last but not least, it really depends on what you are cooking. Ready- made meals aren't that healthy in any way you want to cook them. A suggestion, if you want a hectic life, you can prepare meals like bolognaise salad perhaps? You are the one who prepares and control the amounts in the dish.

2. Reports have linked charred food to cancer. How safe is BBQ food?

In truth, myths have been exaggerated about grilled or BBQ food has high risk of suffering from cancer.
www.bbqmyths.com/grilledfoods.html

Register 19 Part Two

1. Is the temperature cycle different between sexes?
Most human bodies is generated in the deep organs, such as the liver, brain and heart. Humans have been able to adapt to different climates, like hot humid or the cold. However, high temperatures or cold temperatures can place him in great danger or injury (bleeding lips, bleeding nose), heat stroke or even death. Both of the sexes can gain or lose temperature depending on the surrounding temperature around them or climate. I guess I can safely say there is no big difference of temperature cycle between sexes.

2. Does age affect the temperature cycle?
I'm not really sure about this. However I believe that as we get older, our body muscles and bones tends to be weaker than before? That is why we are encouraged to drink more milk and carry out simple and light exercises. But does age affect the temperature cycle? I think age does affect. We can see older people and babies tend to get sick easily; they are the generations who gets tired easily and do less exercises. Overall, i'm not sure about this.

3. Does outside temperature affect body temperature?
In hot conditions, sweat glands under the skin secrete sweat.
This causes heat loss through evaporative cooling as well as a lot of essential lost of water.
In cold conditions, sweat stopped producing. Muscles under the skin contracts and this results of hairs to stand on end and acts as an insulating layer, trapping heat. This will also causes 'goosebumps' like how most people described as when they feel a shiver throughout their body.

4. Will exercise at different times of the day affect your body temperature cycle?
The time of day and other circumstances affect the body's temperature. Estimated, one's temperature tends to have the lowest value in the second half of the sleep cycle. The body temperature also changes when one is hungry, sleepy or cold. Even when the process of thought changes his body temperature.

5. Is there a correlation between body temperature and concentration, mood, learning etc?
Yes there is a correlation between body temperature and concentration, mood, learning and such. As said above, one's body temperature greatly depends on the activities he carries out. Even if he's thinking, feeling cold, hungy, full of rage, there will be a gain or loss in temperature.

Register 19

If they (aliens) offered us all their scientific knowledge, in my opinion, it will be good. They are the 'future species' who has intelligently thought of the upcoming happenings around us and have experimented much more than our generation has done. On the other hand, this is a mixture of the good and bad. It greatly depends on whether the informations are being used for good or bad intentions.