Please clearly show the math work on how to get the deserts for parts a-d

3. [8] The thin lens equation is - = 7 + 7, where f is the focal length, d; is the distance to the image and do is the distance to the object. Consider a cell phone camera. a) From your own measurement give an estimate for f. b) If you are taking a selfie, give an estimate for do. c) Note that do >> f. Show that (i.e. do the algebra) 6; = di - f ~ -, and estimate a numerical value for 6; from a) and b). d) Compare d; to a for optical light. a) f b) do c) di d) a