पहले तो principal axis ko lightly banao, aur focal points mark karo. Phir har kiran ko ekdum seedha draw karo – parallel wala focal point se, centre se hokar wala seedha, aur focal se aane wala parallel jaaye. Exam mein arrows ki direction bhoolna mat, warna mere jaise half mark kat jaate hain! Main khud optics revise kar raha hoon, aur kal hi ek ray diagram ki practice mein maine convex lens ko concave bana diya tha – sketch pen se, mita bhi nahi raha tha.
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