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Términos y frases comunes
angle appear axis beautiful becomes bodies called circle close colours common concave conjugate convex lens corresponding course crossing crystal crystalline lens curious curves dark density direction distance diverging edge effect equal experiment fact fall feet focal length foci focus follow fresh front further give glass green half happens heat hole inches incidence increase kind larger learned lenses less light lines look magnifying means medium meet minute mirror moving nature never object once opposite optical parallel pass perfect perfectly picture piece plane polarised position principle prism produce properties proportion radiant rays reach reflected refraction result reverse round seen side sine sometimes spectrum sphere straight suppose surface telescope thing tion turned undulations violet waves whole wonderful
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