For labelling, simply take your NCERT diagram and learn these five: cornea, iris, lens, retina, optic nerve. Myopia diagram is even simpler: draw a ray converging *before* the retina, then add a concave lens to diverge it right. In Kota, we make students draw these ten times blindfolded.
Yet, what I remember is my granddaughter's first biology book, her finger tracing the lens, saying, "Grandpa, this is where your *spectacles* help." That joy, ya, it fixes more than any ray diagram.
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