<![CDATA[This study aimed to determine the difference and increasity of student learning outcomes on the implementation of PBL and discovery learning on the optical material. The design of this study used was one group pretest-posttest design. In the experimental class, the average score of student learning outcomes was 53.90 and the increasing of the average score of student learning outcomes was 28.30 with N-gain of 0.37 (medium category). In the control class, the average score of student learning outcomes was 38.10 and the increasing of the average score of student learning outcomes was 9.60 with N-gain of 0.13 (lower category). The result showed that there were differences in student learning outcome between experimental class that has been applied PBL and control class that has been applied discovery learning. It can be conclude that the implementation of PBL was more effective to improve student learning outcomes.Penelitian ini bertujuan untuk mengetahui perbedaan dan peningkatan hasil belajar siswa pada penerapan PBL dan discovery learning pada materi optik. Desain penelitian yang digunakan adalah One Group Pretest-Posttest Design. Pada kelas eksperimen skor rata-rata hasil belajar siswa adalah 53.90 dan kenaikan skor rata-rata hasil belajar siswa sebesar 28,30 dengan N-gain sebesar 0,37 (kategori sedang). Pada kelas kontrol skor rata-rata hasil belajar siswa adalah 38.10 dan kenaikan skor rata-rata hasil belajar siswa sebesar 9,60 dengan N-gain sebesar 0,13 (kategori rendah). Hasil penelitian menunjukkan bahwa terdapat perbedaan hasil belajar siswa antara kelas eksperimen yang menerapkan PBL dan kelas kontrol yang menerapkan discovery learning. Hasil tersebut menunjukkan bahwa penerapan PBL lebih efektif untuk meningkatkan hasil belajar siswa.Kata kunci: discovery learning, hasil belajar, problem based learning]]>
