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Convex Lens Imaging Laws - Quiz

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When Xiao Ming uses a camera to take a picture, if he wants the image in the lens to be larger, he should:

Convex Lens Imaging Laws - Quiz - Quiz Questions

Test your understanding and application ability of the relationship between $u, v, f$ through the following questions.

1. When Xiao Ming uses a camera to take a picture, if he wants the image in the lens to be larger, he should:

A. Move closer to the object while extending the lens forward (increasing image distance)
B. Move away from the object while retracting the lens backward (decreasing image distance)
C. Just open the aperture wider
D. Just shorten the exposure time

2. A convex lens has a focal length of 10cm. When the object distance is 15cm, what kind of image can be obtained on the screen?

A. Inverted reduced real image
B. Inverted magnified real image
C. Upright magnified virtual image
D. Upright reduced real image

3. In the convex lens imaging experiment, if no image can be found on the screen no matter how it is moved, which of the following is NOT a possible reason?

A. The centers of the candle, lens, and screen are not at the same height
B. The object distance is less than the focal length, forming a virtual image
C. The object distance equals the focal length, light rays differ parallel and cannot form an image
D. The bulb is too bright

4. True or False: As an object moves from infinity towards the focus of a convex lens, the real image moves further away from the lens and increases in size.

True
False

5. If a convex lens forms a real image of the same size and the object distance is measured to be 20cm, then the focal length of the lens is:

A. 20cm
B. 10cm
C. 5cm
D. 40cm

6. The essential difference between a real image and a virtual image is:

A. Real images can be seen with the naked eye, virtual images cannot
B. Real images are upright, virtual images are inverted
C. Real images are formed by the convergence of actual light rays and can be presented on a screen
D. Real images are magnified, virtual images are reduced

7. When a lit candle is placed in front of a convex lens, an inverted, magnified real image is obtained on the screen. At this time, the distance from the candle to the lens (object distance $u$) satisfies:

A. $u > 2f$
B. $u = 2f$
C. $f < u < 2f$
D. $u < f$

8. When projecting slides, to get a larger image on the screen, the operation that should be taken is:

A. Move the projector further from the screen, and the lens closer to the film
B. Move the projector further from the screen, and the lens further from the film
C. Move the projector closer to the screen, and the lens closer to the film
D. Move the projector closer to the screen, and the lens further from the film