Converging Lens Questions: 1) How can you tell if an image is real or virtual? 2

Question

Converging Lens Questions: 1) How can you tell if an image is real or virtual? 2) Explain why, for a given object to image distance, there are two lens positions where a clear image forms. 3) By looking at an image, how can you tell that the magnification is negative? Converging Lens Questions: 1) How can you tell if an image is real or virtual? 2) Explain why, for a given object to image distance, there are two lens positions where a clear image forms. 3) By looking at an image, how can you tell that the magnification is negative? Converging Lens Questions: 2) Explain why, for a given object to image distance, there are two lens positions where a clear image forms. 3) By looking at an image, how can you tell that the magnification is negative?

Explanation / Answer

1) If the image is formed at back of the lens then its a virtual image. As real image formed where rays are converged that is at the front.

2) If you kept a object at 2F the image will be formed at other side of the lens at a distance 2F. Now if you move the lens towards object slightly, that is <F then image will form at the same place but magnified that before.

3)If the image is inverted then the magnification is negative.

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