(b) A camera equipped with a converging lens is used to snap a photograph of a mountain very far away from the photographer. In the camera, the CMOS image sensor lnctions as a screen upon which the image is formed and being digitally recorded. (i) Calculate the focal length [in mm) of the converging lens if the distance between the lens and the CMOS image sensor is 12.0 mm when capturing the far away mountain. (3 marks} (ii) The photographer then uses the same camera to snap a photo of a glass marble close to him. To get a clear picture, he must reset the camera lens 6.00 mm thher away from the CMOS sensor. Determine the distance (in mm) ow the marble to the camera lens. (3 marks}