ASTR 1P01 Lecture Notes - Eyepiece, Chromatic Aberration, Ionosphere

• School: Brock University
• Department: Astronomy
• Course: ASTR 1P01
• Professor: Bozidar Mitrovic

Document Summary

All information about stars is obtained from the light which they emit using. Monday october 29th 2012 the physical laws light is just a particular type of electromagnetic wave. Wavelength is denoted by greek letter a (lambda) color < > wavelength to express the wavelengths of visible light we use nanometers (nm) : 1 nm = 10*-9m for visible light 400 nm(violet) < 2<700nm (red) At the wavelengths longer than 700nm we have infrared: microwaves, radio waves some (but not all blocked by our atmosphere) At wavelengths shorter than 400nm: uv, x-rays, gamma-rays. All stars are so distant that the amount of their light which enters the eye is very small telescopes are used to collect more light they are based on: refraction of light. Because light propagates at a reduced speed in the denver medium. Wednesday october 31st, 2012 (so- called refractors) use a lens to collect (gather) light in this case the objective is a lens.