2: (5 points) A refractometer is a device used in laboratory medicine to measure concentrations of aqueous solutions such as the overall plasma protein in a blood sample. A simplified setup is shown in figure. A liquid sample whose index of refraction is to be determined is placed on a glass block of rectangular cross section. A laser beam enters the glass block on its KL side, travels through the glass, reaches to the glass-liquid interface, and refracts such that it is parallel to the KM side of the glass; i.e. # = 90$ p below, composed of two lenses ! and " , separated by 25cm. The first lens has a focal length ! = 5 cm, and the second one, a focal length " = 10 cm. a) An object is located 10cm to the left of the first length, determine at what distance from the lens ! the image is after the first lens ! . (1 point) ! =