An unknown type of lens produces a virtual image. By careful observation, you kn

Question

An unknown type of lens produces a virtual image. By careful observation, you know that the object is located at 17.4cm and that the image is 3.6 times larger than the object.

If the lens is converging, which of the following must be true to allow for that? Select all that apply.

a) The image is magnified and only converging lenses are capable of producing a magnified image.

b) The focal length is positive and converging lenses have positive focal lengths.

c) The magnification is positive and only converging lenses can produce positive magnification.

d) The image distance is negative and converging lenses are the only type of lens capable of producing negative images.

I know the answer is not B, nor is it B and C.

Explanation / Answer

Correct Answer is A and B

Given that,

object dist = o = 17.4 cm ;M = 3.6

We know that, for a converging lens, the focal length is positive.

Magnification given is positive. And we know that, M = -i/o, so image dist (i) is negative to yield a positive magnifitcation.

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