# What is the image distance of a 4 cm tall object placed 40 cm from a concave mirror having a...

## Question:

What is the image distance of a 4 cm tall object placed 40 cm from a concave mirror having a focal length of 10 cm?

a. -13.3 cm

b. 13.3 cm

c. -40.0 cm

d. 40.0 cm

## Mirror Formula

Mirror Formula is a relation between the object distance, image distance and focal length of a mirror as stated below

{eq}\begin{align} \frac{1}{f}= \frac{1}{d_i} + \frac{1}{d_o} \end{align} {/eq}

Where **f** is the focal length of the mirror, {eq}d_i {/eq} is the distance of the image, and {eq}d_o {/eq} is the distance of the object.

## Answer and Explanation:

**Data Given**

- Height of the object {eq}h_o = 4 \ \rm cm {/eq}

- Distance of the object {eq}d_o = - 40 \ \rm cm {/eq}

- Focal length of the mirror {eq}f =...

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What is a Concave Mirror? - Definition, Uses & Equation

from Physics 101: Help and Review

Chapter 14 / Lesson 17
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