<![CDATA[This study aimed to develop a simulation-based learning medium for visualizing emission spectrum and predicting spectral colors based on the diffraction grating phenomenon. It employed a Research and Development (R&D) approach, focusing on product development, validation, and feasibility evaluation. The product was assessed through expert validation and small-group testing involving 12 students from the Physics Education Study Program. The validation results showed that the simulation was rated as highly feasible, achieving content validity of 100%, construct validity of 97.3%, linguistic and instructional clarity of 93.3%, and usability and interactivity of 93.3%, resulting in an overall validity score of 96%. These findings demonstrate that the simulation is valid and suitable as an instructional tool for teaching emission spectrum and diffraction grating concepts. As this study was limited to the product development and feasibility evaluation stages, the effectiveness of the simulation in improving students' conceptual understanding and learning outcomes remains to be investigated in future research.]]>
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