You are 2.4 m from a plane mirror, and you would like to take a picture of yourself in the mirror. You need to manually adjust the focus of the camera by dialing in the distance to what you are photographing. What distance do you dial in

4.8 m

Explanation:

A mirror is a reflecting surface on which rays of light are reflected. Reflection occurs when a ray of light bounces off a surface, coming back into the original medium.

There exists two types of mirrors:

- Flat mirrors: they consist of a flat surface

- Curved mirrors: they consist of curved surfaces. They are further divided into convex mirrors and concave mirrors.

For a flat mirror, the image produced from the mirror is always:

- Virtual (on the other side of the mirror)

- Of the same size as the object

- Laterally inverted

- Upright (same orientation as the object)

Moreover, the image produced by a flat mirror is at the  same distance from the mirror as the object.

So in this case, since the person is 2.4 m from the mirror, then the image is produced 2.4 m from the mirror (but on the other side).

This means that the total distance between you and your image in the mirror is:

d = 2.4 + 2.4 = 4.8 m

Therefore, the focus of the camera must be adjusted to be at 4.8 m.

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