Problem

A $5.00 cm$ tall object is placed $4.00 cm$ from a convex mirror with a focal length of $7.50 cm$ . What is the distance of the image from the mirror?
$- 0.383 cm$
$- 0.117 cm$
$- 8.57 cm$
$- 2.61 cm$

Answer

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Answer

$d_{i} = - 2.6087 cm$

Steps

Step 1 ： $\frac{1}{d_{i}} = \frac{1}{f} - \frac{1}{d_{o}}$

Step 2 ： $\frac{1}{d_{i}} = \frac{1}{- 7.50} - \frac{1}{4.00}$

Step 3 ： $d_{i} = - 2.6087 cm$

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