The scale factor (k) can be calculated by dividing the image length by the actual length.
1.9cm
Practice makes perfect
To find the actual length of the object, remember 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 eight times the object's actual size. Therefore, the scale factor is k=8. The object's length through the magnifying glass is 15.2cm. We will use these values and the formula to find the actual length.
