lecture3

Lecture3 - Optics Telescopes Today basics Fri high tech modern Telescopes collect light from faint stars etc!must bend light paths(refraction and

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Today : basics Fri : high tech. modern Digital Universe http://www.haydenplanetrium.org/universe/ Telescopes • collect light from faint stars, etc. ! must bend light paths (refraction and reFection) sensitivity = telescope area = " R 2 (R=radius of reFector) (also depends on detectors) ! resolution better, the bigger the telescope but … for opt. tel. atmospheric ‘seeing’ limits resolution to 0.5 arcsec (can use ‘adaptive optics to correct ‘seeing or space) 2 physical mechanisms : refraction : bending at the interface between a dense medium and a less dense medium • reFection (at an electrically conductive interface) # 1 # 2 # 1 = # 2 Silvered glass dense (water, glass) n 2 =c/c 2 less dense (air, vacume) n 1 =c/c 1 # 1 # 2 Snell's Law : n 1 sin # 1 =n 2 sin # 2 ±ermat’s principle : light travel the path of least time AEB = AEB’ ! minimum s.t. E ! C i.e straight line path
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collecting/concentrating light waves : to maximize the signal , waves from different parts
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This note was uploaded on 09/25/2010 for the course AY 106 taught by Professor Schrerr during the Winter '09 term at UMBC.

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Lecture3 - Optics Telescopes Today basics Fri high tech modern Telescopes collect light from faint stars etc!must bend light paths(refraction and

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