Determine the image distance when the focal length of a convex mirror is 12 cm and the object distance is 24 cm?

6 cm

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24 cm

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8 cm

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12 cm

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Solution

The correct option is B 24 cm
Given:
Focal length, $f = - 12 c m$
The object distance, $u = - 24 c m$

Using lens formula,
$\frac{1}{v} + \frac{1}{u} = \frac{1}{f}$
$\frac{1}{v} + \frac{1}{- 24} = \frac{1}{- 12}$
$v = - 24 c m$

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