Question

Which of the following represents an upside-down image?

O A. +do
O B. -do
O c. +m
O D.-m​

Answer 1

D. -m

Step-by-step explanation:

The magnification of an image is equal to the following ratio:

`m = (y')/(y)`

where

y' is the size of the image

y is the size of the real object

We have two situations:

- When m is positive, it means that y' has the same sign of y --> so the image has same orientation of the object (= image is upright)

- When m is negative, it means that y' has opposite sign to y --> so the image has opposite orientation to the object (= image is upside down)

So, the correct answer that describes an upside-down image is

D. -m