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Title: Help! Dont know what to build Post by: bentze on March 25, 2006, 02:25:55 PM I'm taking part in a sekolah menengah science competition. I am suppose to build a machine/robot/something creative etc.
I have about less than two weeks to build my project, yet, I haven't had any good ideas! So now, I need some help. Could some one suggest me something seriously easy to build. Since this is an astronomy forum, anyone can easily suggest a telescope. Well, I know how all telescopes work, but there are many many problems. The time constraints don't give me enough time to grind glass, assemble plastic etc.... I've got a few loose ideas, like a light adaption device, for stargazers who need to get from a dark place to a bright place very quickly. You know, like when you're in a cinema and suddenly, someone shines a bright flashlight at you. My proposed device is meant to de0dialated to pupils to recieve less lght. Sound good? If not, please help! Title: Re: Help! Dont know what to build Post by: bentze on March 30, 2006, 05:36:27 PM Helooo?
Anyone? Title: Re: Help! Dont know what to build Post by: kamayok3 on March 31, 2006, 08:58:52 AM Sorry...Cant help up! Have no idea. :mrgreen:
Tommy Title: Re: Help! Dont know what to build Post by: rizal on March 31, 2006, 10:23:24 AM Found this in the internet
Quote The Eye and Dark Adaptation TO MAXIMISE YOUR SENSITIVITY to dim light you should allow sufficient time for your eyes to get used to the dark. You must also allow for continued dark adaptation during the observing period. During the first minute, the eye's sensitivity increases ten fold. In 20 minutes it increases 6000 fold and forty minutes of dark adaptation increases sensitivity 25,000 times! This means that a faint object which was overlooked in an early part of your observing run may be readily seen later, so don't expect to see faint objects at their best until at least a half hour into an observing session. Note that light adaptation is much faster that dark adaptation, so even a brief exposure to light will destroy your night vision. It is also best to consistently avoid all light for as long as possible before observing. Prolonged exposure to bright sunlight reduces your ability to dark adapt for a couple of days; wear dark glasses at the beach. In the long run, ultraviolet light ages both the eye lens and retina, reducing sensitivity. So if you wear eyeglasses outdoors, ask your optometrist for UV-filtering lenses. Night vision is also impaired by alcohol, low oxygen and low blood sugar. So don't observe while drinking, smoking or fasting. In fact, nicotine retards dark adaptation to such an extent that even a single cigarette smoked half an hour before your eyes start dark adapting will slow down this process. Maybe you can start with UV lenses? But this need lot of statistics showing how it can improves light adaptation . |