Arre, sign convention toh tension hai hi! Always keep your coordinate system fixed: object towards left is -u, focal length + for convex lens/mirror, and remember virtual image has +v for lens but -v for mirror! 🤯 Ray diagrams? Draw principal rays—parallel to axis, through focus, through centre—bass, intersection point mil gaya image!
Mera life ka lesson: maine gym ke purane AC ke saamne mirror laga ke focal length practice ki thi—practical lagne par formula yaad rehta hai!
#exams#study
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