Question

A concave mirror of focal length17.5 cm forms a real image24.8 cm from the mirror. What isthe magnification?(Mind your minus signs.)(Unit = cm)

Answer 1

We can use the mirror formula:

`(1)/(f)=(1)/(v)+(1)/(u)`

The focal length, f, is 17.5 cm. (remember the minus sign)

The object distance, u, is 24.8 cm. (minus sign)

We can look at the magnification equation:

`M=-(u)/(v)`

Now, let's plug in the numbers for u and v.

`M=-((-24.8))/((-17.5))`

Simplify this equation to get:

`M=-1.4171`

The magnification of the image is -1.4171 cm.