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Thanks Laser chick. From the above link I got this:- Do you see anything wrong in this explanation? It actually says "It doesn’t matter in which direction you shoot" OMG!!!!!!!!!!! "IT DOESN'T MATTER IN WHICH DIRECTION YOU SHOOT" How the hell can it NOT matter in which direction you shoot? Come...

I've already taken into account refraction of 1/7. Please show me proof of why 15mm isn't a suitable height?

The photo out the plane window. I'm struggling to get reference points to tell either way if it's flat or curved. Safety! I'm new to lasers and if it hadn't been for you lot I would have never known. The three lasers I previously purchased were over the net with no real warnings I can remember...

Well, it looks like I'm going over kill because I negotiating a 520nm 1W laser with 3 element lens at the moment. Apparently 520nm is replacing 532nm as the new green. I'm hoping to use it on a 2 mile stretch of water if the 1mile stretch is successful.

According to flat earth theory: You can see this pizza crust in the form of the Antarctic which has 200 foot high wall of ice entrapping all the oceans of the world. The edge of the earth is a little further inland from the Antarctic ice wall which is in perpetual darkness and impenetrable...

I recon for that to work you would have to be 276m tall, lol. Infact, if the earth is flat, going higher shouldn't work at all due to the laws of perspective. Someone must have tried this with a drone. If the earth is flat and you watched the sunset from high up and then dropped to earth after...

Well, it looks like I can't show my face round here any more then. I tried not to mention flat earth. Look at my original post. I don't really want to discuss it. It's several other users who are asking for evidence of flat earth and I'm saying 'NO' I don't want the debate. Now I wont be able to...

Teej, Well, it's a good job I'm not placing any bets then. If it's round it's round and if it's flat it's flat. The only people who care is the people who have vested interests. Anyway, you seriously don't think anyone will listen to a tin foil hat wearing freak like me do you? I can't believe...

Thanks Koff! Eudaimonium, You sound like you really don't want me to do this experiment. I will post the results which ever way it goes. It doesn't really affect my life in any way. I'm easy with what ever comes of it. Do I sound like I'm biassed? What does it matter to anyone what the results...

You already know my opinion of space and NASA.:tinfoil::tinfoil: I know what results I will get from my experiment so I'm going to take photos of my aparatus and you can tell me where I've gone wrong. :D

You've just said the same thing. I'm saying IF any light from the laser appears at 15mm or less on the other side there will be no curvature on the lake(presuming I'm doing it right). Do you agree? You say "As for technique, as mentioned, sure, you can misalign it, not account for beam...

How can I do it wrong? I've just got to hold the laser(in a clamp) 15mm above the water and fire it across the one mile of lake. If the earth is round it will be impossible for the laser to appear less than 150mm(approx) on the other side. If the world is flat the laser will appear any where...

Yes, I think the Earth is flat. There is too much evidence proving there is no curvature in the Earth never mind about all the other evidence. I've read the '10 mile distance laser' thread and it was very helpful, thanks. After reading the 10 mile thread I now know that you are all going to...

Thank you everyone! So which is best for my application, beam expander or 3 element lens?? Ha ha, I thought the mention of flat earth might provoke ridicule but I'm surprised at how much on a technical forum like this. I know of other experiments with telescopes and boats and horizons etc.. but...

Thanks for all your responses. I'm in the UK. It's a flat earth experiment I'm trying to conduct on a lake. The curvature of the earth gives a 50mm hump in the middle so I want to set the laser at 15mm above the water at one end to see if this hump actually exists. If it doesn't exist I would...

I have accidently duplicated this thread. Can someone please tell me how to delete it?

I am very new to lasers. I need to be able to fire a laser over a distance of one or two miles and keep the dot small enough and bright enough to be seen at the other end. I have purchased three lasers two of which didn't have the enough power(1mW) and one 2W(LuckLaser cost £80) which didn't...

I am very new to lasers. I need to be able to fire a laser over a distance of one mile and keep the dot small enough and bright enough to be seen at the other end. I have purchased three lasers two of which didn't have the enough power(1mW) and one 2W(LuckLaser cost £80) which didn't keep a...