For the objective lens:
1/p1 + 1/q1 = 1/1.6

For the eyepiece:
1/p2 = 1/2.5 since q2 = infinity
Therefore p2 = 2.5 cm
Separation of lenses = p2 + q1 = 22.1 cm
q1 = 22.1 - 2.5 = 19.6 cm
1/p1 = 1/1.6 - 1/19.6 = 0.5740
p1 = 1.74 cm

Return to Self Test 4