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In this paper we are going to present a detailed study of conceptual understanding in optics amongst university graduate students. This study was made during a workshop on "Active learning in optics and photonics" organized at physics department, Karachi University. Our tool of investigation was the questions based on the ALOP manual's light and optics conceptual evaluation. The detailed analysis of answers reveals that our students lack in applying simple concepts of reflection and refraction to real situation. Also, they posses some wrong ideas impinged in their minds due to poor teaching/ learning methods in schools. .

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