L. Yuliati, R. Fauziah, A. Hidayat
This study aims to determine students' critical thinking skills in authentic problem based learning, especially on geometric optics. The study was conducted at the vocational school. The study used a quantitative descriptive method with the open question to measure critical thinking skills. The indicators of critical thinking skills measured in this study are: formulating problems, providing simple answers, applying formulas and procedures, analyzing information, making conclusions, and synthesizing ideas. The results showed that there was a positive change in students' critical thinking skills with the average value of N-Gain test is 0.59 and effect size test is 3.73. The critical thinking skills of students need to be trained more intensively using authentic problems in daily life. © Published under licence by IOP Publishing Ltd.
Physics Department, Universitas Negeri Malang, Malang, Indonesia; Vocational School 1 of Bondowoso, Bondowoso, Indonesia
