Question

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

Answer 1

Answer:

B. A virtual image that is larger than the object

Explanation:

The magnification of a lens is given by

$m=\frac{h_i}{h_o}=-\frac{d_i}{d_o}$ (1)

where

$h_i$ is the size of the image

$h_o$ is the size of the object

$d_i$ is the distance of the image from the lens

$d_o$ is the distance of the object from the lens

Some considerations:

$h_o, d_o$ are always taken as positive

if $h_i > h_o$, the image is larger than the object, otherwise it is smaller

if $d_i > 0$, 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) $h_i > h_o$ --> image is larger than the object

2) $d_i < 0$ --> the image is virtual

So, the correct choice is

B. A virtual image that is larger than the object

Answer 2

Answer:

B. A virtual image that is larger than the object

Explanation:

Quiz verified