*happy sigh* I can now listen to LWY without threatening to cry. I'm going to think of Gravitation and love it forever now, even though I wish I didn't due to an inherent distrust of anyone from Neighbours. I can also sing it perfectly, melody or harmony, which increases my love of it. I am aware that this probably shouldn't be happening and is a source of deep shame, but I can't do anything about it! Discovered a new Matchbox 20 song on the radio, fell in love with it, downloaded it and am now listening to it and LWY obsessively. Sad, sad little me.
Somehow, through very small periods of work interspersed with much LJing and other non-work things, my physics assignment (the research part) has finished itself. Was rather surprised by this, as normally my assignments have to painfully coaxed out of my notes and brain and do not simply appear in such a helpful manner. I have decided that I prefer physics assignments over english assignments in a BIG WAY because research is so much easier than forced creativity, which is not something I enjoy.
Refracting telescopes, both terrestrial and astronomical, use lenses to gather light and bring their image to a focus. In an astronomical telescope there are two lenses, an objective of large diameter to collect light and an eyepiece to create magnification. The image formed by these 'scopes is inverted, but this is no real problem for astronomers – it makes very little difference if an astronomical object appears upside down. Some telescopes use a kind of prism called a star diagonal to correct this inversion, but this causes the image to become laterally inverted.
Refracting terrestrial telescopes, however, need the image formed to be upright – otherwise the viewer is confused and the telescope is not much use! So a third lens, an erecting lens, is used in addition to the objective and eyepiece. This lens causes the image formed to be upright.
The final image in a refracting terrestrial telescope is dimmer than in a refracting astronomical telescope simply because the light has passed through more lenses before it reaches the observer's eye. Every time light passes into or out of a glass lens, a small percentage of the light is reflected and absorbed, thus reducing the brightness of the final image in the terrestrial 'scope. The increased brightness of the picture is one reason why most astronomical telescopes do not bother to use the extra lens and create an upright image. It took me FOREVER to find that out and finish that question. My God. Spent my free lugging ancient physics textbooks around the library so that I could copy out confusing diagrams for the second part, which I am yet to start. I'll do it... later... *vague hand wave* Really not looking forward to tomorrow. I hate cleaning. I hate driving lessons. My mother found out about Xmen, laughed, and cheerfully reminded me that I would be staying home to clean the house for her.
Maths test is over! Only SEVEN assessment pieces to go now! Yes, Teegs, I know. Shut up. I would also like to say a huge thanks to
woodstock_21 for all the lovely piccies that she has bestowed on me out of the goodness of her heart. *hugs* My diary is lovely and my locker will become so as soon as I remember to bring blutack to school.
Hope everyone has fun tomorrow. EUJAR - WATCH OUT FOR THE CATHEDRAL!! REMEMBER!!