First slide

Ray optics

Question

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 look like

Moderate

A
B
C
D

Solution

$\frac{1}{v} - \frac{1}{u} = \frac{1}{f}$
This is a form of hyperbola

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