Özet:

This study has been conducted to determine the university students' undear- standing levels and misconceptions about light and atom concepts. This study has been practiced to 62 students of science teacher program on 2003-2004 education session's autumn term. The study data have been obtained from a test which occurs 16 items (for 62 students) and an interview which occurs 12 items (for 12 students). The findings from the test and the interview showed that students' undear- standing levels are respectively 26% and 84% and students' misconceptions about these concepts are respectively 34% and 6%. Some of the misconceptions about light concept; "light is a substance that illuminates wherever it devolves," "light is a beam that breaks out from a source and outgoing endless." And about the atom con- cept, "atom is the smallest and undividable piece of a substance." This study shows that students have a nominal learning level about light concept and have a lot of mis-conceptions about light and atom concepts. We believe that this study can be beneficial if the same studies execute in other education faculties.

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