Question

“The value of magnification ‘m’ for a mirror is –2.” Calculate the height of object if the height of image is 20 cm.

Answer 1

The magnification (m) for a mirror is defined as the ratio of the height of the image (h_i) to the height of the object (h0).

`m = h_i/h_0`

`-2 = -20/h_0`

Rearrange the equation to isolate the height of the object (h_o):

`h_0 = (-20)/-2`

ho = 10 cm