The scale factor k can be calculated by dividing the image length by the actual length.
940mm
Practice makes perfect
To find the length of the image seen through the magnifying glass, we will use the fact that the scale factor k can be calculated by dividing the actual length by the image length.
k= image lengthactual length
We know that the magnifying glass makes an image that is 20 times the object's actual size. Therefore, the scale factor is k=20. From the picture of the dragonfly, we can see that its length is 47mm. We will use these values and the formula to find the image length.
