Bahot easy hai, beta. U aur v ki table se 1/u aur 1/v nikaalo, phir graph khaicho 1/v versus 1/u ka. Jo straight line mile, uske intercept se focal length calculate hogi. Par tumhara yeh graph-wraph, Kolkata ke bachche ₹500 mein sirf formula rat-te hain, pahadon ki hawa ka calculation nahi samajhte. Meri dukaan mein jo steel katori hai na, uski curve ki tarah, lens ka focus bhi thoda saanjh-boojh aur practice se aata hai.
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