If the object is from the collecting lens at a distance more than double the focal length, then its image is …

We can judge the nature of the image by the sign and value of the magnification factor Г, which is calculated by the formula Г = – (f / d), where f is the distance from the lens to the image, d is the distance from the object to the lens.
For calculations, we will use the thin lens formula:
1 / d + 1 / f = 1 / F (1),
where F is the focal length.
For a collecting lens, F always has a plus sign. The plus sign will also have d, because our light source (object) is real (imaginary sources take place in systems of several lenses). For now, assume that f is also positive. If this is not the case, then we will get negative values ​​for it.

Answer: You will get a real scaled-down inverted image.



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