How to draw perfect Concave & Convex lenses with pencil and Compass

Best tutorial for grade 8-12 students. Often due to poor drawing skills students lose marks in ray diagrams. You don't need to be a good artist to learn them. just follow the instructions and go through the complete video well.
Links
Why is Concave Lens Diverging & Convex Lens Converging? How to draw normal to the lens
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How to draw Concave Lens & Understanding ray Diagrams for Concave lens, magnification
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Rules for Image formation in concave & convex Lenses | Grade 10-12
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Why No Refraction through optical center of lenses? | Grade 10 -12 ICSE
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HOW TO DRAW BEST TELESCOPE RAY DIAGRAM | 5 MIN CHALLENGE | STD 10-12 | PHYSICS BOARD EXAM
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