This study investigates the readiness and perceived understanding of secondary school physics students in Sarikei, Sarawak, regarding the implementation of light and optics nature-based learning (NBL). The objectives were to evaluate students' readiness, their perceived understanding of light and optics, and the correlation between these two variables. A quantitative survey with Likert-scale questionnaire design was employed, targeting 100 Form 4 science stream students using cluster random sampling. The validity and reliability of the instrument were tested through a pilot study, yielding a Cronbach's alpha value above 0.8, indicating high reliability. Data analysis was conducted using descriptive and inferential statistics, including mean, standard deviation, and Spearmen Correlation, showed that high levels of student readiness and perceived understanding, with significant correlations between students' readiness and their perceived understanding of light and optics in NBL contexts......

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