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Daniel Fischbach Physics 202-004 – Astronomy 6/21/17 Created on: 2/9/05 Topic: Telescopes All waves reflect, refract and defract Incident wave – Wave traveling that is going to hit another medium Reflective wave – Waves that gets reflected off of the boundary between the two mediums Refracted wave – The part of the wave that gets transmitted (and bent and speed changes) into the other medium The Normal is perpendicular to the boundary between the two mediums Angle of Incidence – Angle between the incident wave and the normal Angle of Reflection – Angle between the reflected wave and the normal Law of Reflection says Angle of Incidence = Angle of Reflection Refracted Angle – Angle between the refracted wave and the normal Law of Refraction – If a wave is transmitted from a less dense medium to a more dense medium it is bent toward the normal – The angle of refraction is less than the angle of incidence If a wave is transmitted from a more dense medium to a less dense medium it is bent away the normal – The angle of refraction is greater than the angle of incidence o Reflection Wave bounces off of a medium o Refraction Wave bends as it passes through a medium Mirror – Used to reflect light o Mirror only has one focus o Concave (Converging) Mirror o Convex (Diverging) Mirror Focus exists Lens – Used to refract light o Every lens has 2 foci o Concave (Diverging) Lens o Convex (Converging) Lens Foci exist Telescope – Device used to detect light from a distance source o Optical telescope – Detects visible light only Reflecting telescope – Uses mirrors Refracting telescope – Uses lenses o Reflecting telescopes are much better than refracting telescopes Glass won’t sag under its own weight (better support) Snell’s Law – Another name for the Law of Refraction Chromatic Aberration Not with reflecting telescopes It can make images blurry o Seeing Bad seeing – Atmosphere from Earth can ruin images 886473734 Instructor: Libarid A. Maljian Page 1 of 2 Daniel Fischbach 886473734 Physics 202-004 – Astronomy 6/21/17 X-ray telescopes are made to be in space because x-rays do not penetrate the Earth’s atmosphere Radio telescope do not have to be put in orbit Look like satellite dishes Instructor: Libarid A. Maljian Page 2 of 2