If the focal length of the lens is 25 mm, the image formed at the sensor will be:A.virtual and upright.B.virtual and inverted.C.real and upright.D.real and inverted.
Question
If the focal length of the lens is 25 mm, the image formed at the sensor will be:A.virtual and upright.B.virtual and inverted.C.real and upright.D.real and inverted.
Solution
The type of image formed by a lens (real or virtual, upright or inverted) depends not only on the focal length of the lens, but also on the object distance (the distance between the object and the lens).
If the object is placed beyond the focal point of a converging lens (which is likely the type of lens we're dealing with if the focal length is given as a positive number, as it is here), the image will be real and inverted (option D).
If the object is placed at the focal point, no image is formed.
If the object is placed between the focal point and the lens, the image will be virtual and upright (option A).
Without information on the object distance, we cannot definitively answer this question.
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