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The purpose of this research is to develop and knowing qualification of LKS based on inquiry with virtual laboratory Yenka on light reflecting material for classroom student X MA Muallimat Yogyakarta. Research and development of this product using steps of research method and development which was put forward by Thiagaran and Semmel (1974), that is define, design, develop and disseminate. Understanding limitations of the time aspect and cost then researchers modify development model only up three step (1) Define (definition research subject), (2) Design (planning research scheme), (3) Develop (development field results). After do a product trial, will be analyzed and then finalized the product and final reporting. Validation done in this research is validation of content that validates products and observation sheet of science process skills. The data obtained in the form of qualitative form of criticism, suggestion and input from validator for product and observation sheet of science process skills while based on result of analysis and quantitative data.