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Geometrical optics

4   Experiment : lenses a
5   Experiment : lenses b
6   Experiment : lenses c
7   CASE 1: Object placed at a distance greater than 2 f From the lens
8   CASE 2: Object placed at a distance equal to 2 f From the lens
9   CASE 3: Object placed at a distance between 2 f And f From the lens
10   CASE 4: Object placed at a distance less than f From the lens

Source:  OpenStax, Siyavula textbooks: grade 11 physical science. OpenStax CNX. Jul 29, 2011 Download for free at http://cnx.org/content/col11241/1.2