I understand that m = -(i)/p However, I dont get Im suppose to read the graph so

Question

I understand that m = -(i)/p However, I dont get Im suppose to read the graph so that I canfind maginication when only p is given
I understand that m = -(i)/p However, I dont get Im suppose to read the graph so that I canfind maginication when only p is given An object is moved along the central axis of a thin lens whilethe lateral magnification m of it is measured. The figurebelow gives m versus object distance p for arange of p. (The horizontal axis is marked in incrementsof 0.5 cm.) What is the magnification(including the sign) of the object when the object is 19.3 cm from the lens? 1

Explanation / Answer

from the graph p = 2.5 cm and m = 2 m = -(i/p) or i = -m * p = -2 * 2.5 = -5 cm We know that (1/f) = (1/p) + (1/i) -----------(1) p = 2.5 cm and i = 5 cm When p = 19.3 we find i from (1) lateral magnification m = -(i/p)

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