Lens maker equation:
For the converging lens:
1/60 + 1/si = 1/40
1/si = 1/40 - 1/60 = 1/120
si = 120 cm
This image distance is the object distance for the diverging lens, which is now 40cm in front of the lens. This is because the lenses are 160cm apart.
1/140 + 1/si = 1/-40
A converging lens with a focal length of 40 cm and a diverging lens with a focal length of -40 cm are 160 cm apart. A 1.0-cm-tall object is 60 cm in front of the converging lens.
a) Calculate the image position in front of the second lens
b) Calculate the image height.
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