They always ask about your aim first—why you chose that particular experiment. Then they grill you on the variables, the procedure, and the graph's slope meaning. But in my experience, the real curveball is when they ask about the *practical* application outside the textbook, like where you'd see this effect in Bangalore traffic! I know because my viva was on lenses, and the examiner asked me to compare it to a rear-view mirror in an auto, completely throwing me off.
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