Development of android-based learning media on light reflection material to improve the critical thinking skill of high school students

The purpose of this study are 1) to develop physics learning media in light reflection material, 2) to know the improvement of students' critical thinking skill after implementing android-based learning media in their study. Research method used was 4-D namely Define, Design, Develop, and Disseminate. The sample of this research was 20 students of class XI MIPA in MAN 2 Yogyakarta. The technique used for collecting data was tests (pretest and posttest) and non test. The instruments used for collecting data was learning media validation sheets and question sheets. The data analysis technique used a sign test to determine the effect of learning media on critical thinking skills improvement. While the improvement on critical thinking skills using the normalized N-Gain equation. The results of this study was 1) learning media developed was valid, 2) android-based learning media improved students' critical thinking skills as evidenced by the value of sig 0.00<0.05, and 3). There is an improvement on students' critical thinking skills calculated using N-gain equation with a low category namely g>0.03 and a high category which is 0.03<g<0.07.