The main focal length of the converging lens is 50 cm. The object is placed at a distance

The main focal length of the converging lens is 50 cm. The object is placed at a distance of 60 cm from the lens at what distance from the lens will the image be obtained?

And so the focal length of the lens (denote F), the distance from the object to the lens (D), the distance from the image to the object (small focus or mF), lens magnification (Y), image height (H), object height (small height or mN )
Formula + -1 / F = 1 / D + -1 / mF
Ф = 0.5m
D = 0.6m
In the collecting lens, the formula takes the form 1 / F = 1 / D + 1 / mF
1 / F = 2
1 / D = 1.6666667.
1 / mF = 0.3333333
Distance from lens to image then = 3m