Refer to the picture on the right. A stamp is placed to the left of the lens, an

Question

Refer to the picture on the right. A stamp is placed to the left of the lens, and its image is formed on a screen to the right of the lens, as shown. Choose the correct answer for each question. 31. Suppose that the stamp is temporarily moved slightly further away from the lens (only for this question). The screen is also moved to find the sharpest possible image. Which is true? A. The image is now larger than before, B. The image is now upright, C. The image is now the same size as before, D. The image is now smaller than before. E. None of these is correct. 32. Suppose that the stamp is temporarily moved closer to the lens (only for this question). The screen is also moved to find the sharpest possible image. Which is true? A. The image is now smaller than before. B. The image is now the same size as before, C. If the object is moved close enough to the lens, it is possible that no sharp image will be found on the screen, D. The image on the screen will become upright, E. None of these is correct. 33. Suppose that the lens is temporarily replaced by one that looks like the one on the right (only for this question). The screen is moved to find the sharpest possible image. Which is true? A. The image will be larger. B. The image will be the same size, C. The image will be smaller. D. It will not be possible to find a sharp image on the screen, E. The image will be upright, F. None of these is correct.

Explanation / Answer

31 D

When the stamp is moved away the image is formed at a place closer to the right of the lense than that of previous position. Then the image distance is larger than the object distance making the magnification smaller.

32 C

If the stamp is placed at a distance less than the focal length, the images formed are virtual.

33 D

A concave lens mmakes virtual images.

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