# Problem: A convex (converging) thin lenses with focal lengths 10 cm and a concave (diverging) lens with a focal length of 20 cm, respectively, are aligned on a common axis, running left to right, the 10 cm lens being on the left. The lenses are separated by a distance of 40 cm. An object is located at a distance of 15 cm to the left of the 10 cm lens. What will be the final magnification and the image distance, as measured from the 20 cm focal length lens?a. M= -2, 6.66 cm to the leftb. M= +2, 20 cm to the rightc. M= +2, 30 cm to the rightd. M= -1, 10 cm to the left

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A convex (converging) thin lenses with focal lengths 10 cm and a concave (diverging) lens with a focal length of 20 cm, respectively, are aligned on a common axis, running left to right, the 10 cm lens being on the left. The lenses are separated by a distance of 40 cm. An object is located at a distance of 15 cm to the left of the 10 cm lens. What will be the final magnification and the image distance, as measured from the 20 cm focal length lens?

a. M= -2, 6.66 cm to the left

b. M= +2, 20 cm to the right

c. M= +2, 30 cm to the right

d. M= -1, 10 cm to the left

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Based on our data, we think this problem is relevant for Professor Witanachchi's class at USF.