Possible location of lenses to choose from in front of the

Solution

1/p + 1/q = 1/f

a) p = 52 cm

1/52 + 1/q = 1/-26

q = -17.33 cm

M = -q/p = 17.33/52 = 0.333

virtual , upright

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b) p = 26 cm

1/26 + 1/q = 1/-26

q = -13 cm

M = -q/p = 13/26 = 0.5

virtual , upright

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c) p = 13 cm

1/13 + 1/q = 1/-26

q = -8.67 cm

M = -q/p = 8.67/52 = 0.666

virtual , upright