Question

You are taking a picture of a giraffe that is standing far away from you. The image is just too small, so you swap the 60-mm-focal-length lens in your camera for a 960 mm telephoto lens. By what factor does this increase the size of the image?

Answer 1

Explanation:

Given that, you are taking a picture of a giraffe that is standing far away from you. The image is just too small, so you swap the 60-mm-focal-length lens in your camera for a 960 mm telephoto lens such that,

$m_1=960\ mm$

$m_2=60\ mm$

We need to find the the factor with which the size of the image increases. It can be calculated by taking ratios of both $m_1\ and\ m_2$

So, $\dfrac{m_1}{m_2}=\dfrac{960}{60}$

$\dfrac{m_1}{m_2}=16$

So, the size of image increases by a factor of 16. Hence, this is the required solution.