What type of image is formed by a lens if m = 3.0?
a. a virtual image that is smaller than the object
b. a virtual image that is larger than the object
c. a real image that is larger than the object
d. a real image that is smaller than the object

B.A virtual image that is larger than the object

Explanation:

The magnification of a lens is given by

(1)

where

is the size of the image

is the size of the object

is the distance of the image from the lens

is the distance of the object from the lens

Some considerations:

are always taken as positive

if , the image is larger than the object, otherwise it is smaller

if , the image is real, otherwise it is virtual

In this situation, we have M = 3.0 (positive number and larger than 1). Looking at eq.(1), this implies:

1) --> image is larger than the object

2) --> the image is virtual

So, the correct choice is

B.A virtual image that is larger than the object

good for her? ? where is the question?