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A 3 cm tall object is placed at a distance of 7.5 cm from a convex mirror of focal length 6 cm then the size of the image is

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5.33 cm

1.33 cm

3.3 cm

10 cm

answer is B.

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Detailed Solution

$\begin{array}{l} u = - 7 .5 cm, f = 6 cm \\ \frac{1}{v} = \frac{1}{6} + \frac{10}{75} \\ v = \frac{10}{3} cm \\ h^{1} = \frac{v}{u} \times h = \frac{10 / 3}{7 .5} \times 3 \\ = \frac{4}{3} = 1 .33 cm \end{array}$

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