Lenses one shot, with the important questions
Vedantu Maharashtra 9 & 10 · YouTube
The lens formula, magnification and power, worked alongside the questions the board tends to repeat.
Lenses
Chapter 7 of Science and Technology Part 1, SSC Std 10 (English Medium). A short revision read — free, no sign-up.
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Hand-picked free resources for this exact chapter.
The full chapter, one video
New Indian Era · YouTube
Ray diagrams built up step by step, including all six object positions for a convex lens.
Lenses from lecture one
JR Tutorials · YouTube
Slower and more thorough, starting from what a lens is before touching any formula.