Below are pairs of radii for thin lenses. Which of the following pairs would result in the formation of a larger virtual image when an object is placed 50 cm from the lens (the lens has an index of refraction of 1.5) Question 4 options: r1 = 20 cm and r2 = 40 cm r1 = -20 cm and r2 = 40 cm r1 = 20 cm and r2 = -20 cm r1 = -40 cm and r2 = 40 cm