Faila, R.E., Solikhah, N.A. and Setiaji, B. 2023. Audio-Visual-Based Optical Applications as a Media to Improve Students’ Understanding of Concepts: A Feasibility Test. Sunan Kalijaga Journal of Physics. 5, 1 (Jun. 2023), 18–26. DOI:https://doi.org/10.14421/physics.v5i1.3458.