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optics astronomy astrophysics physics astro hubble space telescopes stars sun bsc physics core polarisation galaxy cosmology thinfilm interference airwedge newtons ring interference sahas equation spectrum milkyway classification hd catelogue hr diagram types hubble tunning fork cosmic ray cosmological principle radio telescopes refracting telescopes reflecting telescopes telescopes optical lenses lenses undergrad phys solar system sun is a star universe polariser properties of light analyser property light science undergraduate polaroïd brewsters law diffraction thicklens thinlens conditionsforinterference coherence doubleslit red shift and blue shift