Salim K, Tiawa DH. The Use of Instrument to Measure Student’s Understanding of the Concept of Light Refraction Using Animation Slide Show for Secondary School Students. Int J Innov Educ Res [Internet]. 2014 Oct. 1 [cited 2025 Apr. 3];2(10):169-76. Available from: https://scholarsjournal.net/index.php/ijier/article/view/257