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A short linear object of length 2 cm lies along the axis of a concave mirror of focal length 20 cm at a distance of 30 cm from the pole. The size of the image is

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2 cm

4 cm

6 cm

8 cm

answer is D.

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Detailed Solution

$\begin{array}{l} dv = b \frac{f^{2}}{(u - f)^{2}} b = 2 cm \\ Size of the image dv = \frac{2 \times 20^{2}}{(30 - 20)^{2}} \\ = \frac{2 \times 20 \times 20}{10 \times 10} = 8 cm \end{array}$

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