Question

Which of the following represents an upright image?

A. -do
B. +m
C. -m
D. +do

Answer 1

B. +m

Step-by-step explanation:

The magnification of an image is defined as the ratio between the size of the image and of the object:

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

where we have

y' = size of the image

y = size of the object

There are two possible situations:

- When m is positive, y' has same sign as y: this means that the image image is upright

- When m is negative, y' has opposite sign to y: this means that the image is upside down

Therefore, the correct option representing an upright image is

B. +m