If the object is from a lens with a main focal length of 10 cm at a distance of 12 cm, then the distance from the image to the lens is
| December 2, 2020 | education
according to the thin lens formula we have: 1 / F = 1 / f + 1 / d
where f is the distance from the image to the lens,
d – distance from object to lens
F – focal length
so, we have:
1 / f = 1 / F-1 / d = 1 / 10-1 / 12 = 12-10 / 120 = 2/120 = 1/60
flip the fraction: f = 60cm
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