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A student measures the focal length of a convex lens by putting an object pin at a distance u from the lens and measuring the distance V of the image pin. The graph between u and V plotted by the student should look like |
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Answer»
`(1)/(v) - (1)/(u) = (1)/(f)` for a convex lens. u ha to be negative. If `u = oo, v = f and if u = oo, v = f`. A parallel beam `(u = oo)` is focussed at f and if the object is at f, the rays are parallel. The point which MEETS the curve at u = v GIVES, 2F. Therefore, v is + ve, u is negative, both are symmerical and this curve satisfies all the CONDITIONS for a convex lens. 
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