3) 35 mm Camera (4 marks) a) A 35mm film negative is 25x36 mm . If you are using a 100 mm focal length lens, find the dimension and location of the entrance window as well as the field of view for objects at a distance of 10 m. b) Suppose you take of picture of a group of friends standing at this distance (10m), with the aperture iris sent to f/4 and a shutter speed of 1/250 s. If you were to change the f-stop to f/8, what shutter speed would be required to keep the same exposure. What would happen to the depth of field