In order to find focal length of a divergent lens, by measuring the object and i

Question

In order to find focal length of a divergent lens, by measuring the object and image distances, you used two lenses. Why?

Question 4 options:

Two lenses were needed so we could use a known real image from the converging lens to make a virtual image using the diverging lens.

Two lenses were needed because a diverging lens by itself can only form a virtual image. In order to form a real image, a converging lens is required to allow the light rays to reconverge.

We could have used just the divergent lens but the instructors wanted us to solve a more complicated problem.

Two lenses were needed to make the required erect, real final image

Two lenses were needed to make the required inverted, virtual final image

Two lenses were needed so we could use a known real image from the converging lens to make a virtual image using the diverging lens.

Two lenses were needed because a diverging lens by itself can only form a virtual image. In order to form a real image, a converging lens is required to allow the light rays to reconverge.

We could have used just the divergent lens but the instructors wanted us to solve a more complicated problem.

Two lenses were needed to make the required erect, real final image

Two lenses were needed to make the required inverted, virtual final image

Explanation / Answer

Answer: Two lenses were needed because a diverging lens by itself can only form a virtual image. In order to form a real image, a converging lens is required to allow the light rays to re-converge.

Explanation: For measuring of the object and the image distances two lenses should be needed, because the diverging lenses form a virtual image and the converging lenses form a real image.

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