Question

An object is 20 cm in front of convex mirror. If the image height is 1/5 times the object height, determine (a) the image distance b) the focal length

Answer 1

Given, f = 20 cm, u = -20cm, v = ?

As,

$\frac{1}{f} = \frac{1}{v} + \frac{1}{u} \\ </em><em>\</em><em>\</em><em> \frac{1}{v} = \frac{1}{f} - \frac{1}{u} \\ </em><em>\</em><em>\</em><em> \frac{1}{v} = \frac{1}{20} + \frac{1}{20} \\ \\ \frac{1}{v} = 20 \\ \\ v = 10cm$

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