what is the purpose of the parabolic shape of the reflector in a torch.state one advantage and one disadvantage if in a certain torch, the batteries are arranged in parallel rather than having it in series.tom's electric torch with two new dry cells glowed with full brightness yesterday but it does not light today. although the bulb was not fused it did not glow. the barrel of the electric torch had got a little heated. what happened to tom's torch?


In the first place, we are not the YAMMERS as referred. We are just members of Yahoo! Answers Malaysia, which logically form the word YAM. To be a member, you are logically known as YAMmer (agree?) So, that explains why we are not poor losers. We are just winners in every case. Give me 3 loud cheers!!! _
There's an easy answer. If you are seeing an image that's similar to visible light (like the camers your found) you are seeing near infrared. Near infared gets its name because it's close on the spectrum to visible light. On the other hand, if you are seeing an image that looks like you're seeing heat, you're seeing far infared. Far infared cameras are much more expensive than near infrared cameras. Note that there are different naming conventions for infrared depending on who's describing it. Notice the first link has a thermal image and describes it as mid-ir (for middle infrared). If you really want one, look for a FLIR (forward looking infrared) camera.

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