(10 points) Consider the above 2-lens system as a thick lens. Find the location of its focal point Fi. How far is it from Lens #2, including side? You can use any appropriate method.(45 points) A small object is placed 20 cm from the first of a train of following two thin lenses Lens #1: index 1.5 2.5cm 5cm Lens #2: index 1.5 15cm 15cm