THE VALIDITY AND FEASIBILITY OF A HANDBOOK ON THE PROPERTIES OF LIGHT AND REFLECTIONS INTEGRATED WITH 1-SIDE HOLOGRAM LEARNING MEDIA FOR MIDDLE SCHOOL STUDENTS. SPEKTRA: Jurnal Kajian Pendidikan Sains, [S. l.], v. 11, n. 1, p. 10–21, 2025. DOI: 10.32699/spektra.v11i1.8841. Disponível em: https://ojs.unsiq.ac.id/index.php/spektra/article/view/8841. Acesso em: 27 nov. 2025.