What are the placement rules and adjustment results of the equipment in the convex lens imaging expe

Pick B. Analysis: A is false, human mature red blood cells do not have a nucleus and various organelles, while juvenile red blood cells have; b correct, there are large vacuoles in the cells of the mature zone, which are mainly used for osmotic water absorption; c False, higher plants do not have centrosomes, onions are angiosperms among higher plants, so there is no centrosome, while lower plants have centrosomes, and lower plants have algae plants and bryophytes; The substrate in chloroplasts is a tiny membrane structure, which belongs to a submicroscopic structure and cannot be observed with an optical microscope, but must be observed with an electron microscope.

Hope you help. For more professional answers, please contact Beijing Presaisi Instrument, product service: We have established a domestic sales network with perfect technology with professional knowledge and valuable experience in selling products for many years.

For a more timely time....

Place the candle, the convex lens, and the light screen from left to right on the light fixture seat, so that the center of the candle flame, the center of the convex lens, and the center of the light screen are about the same height.

Place the convex lens in the middle, and the candle and the paper screen on both sides, so that the center of the convex lens, the center of the candle flame and the center of the paper screen are about the same height.

Let the wax burn, the convex lens and the light screen are in the same straight line, at the same height (equivalent to the same horizontal height).

1) To do the convex lens imaging experiment, candles, convex lenses, and light screens should be placed in turn on the light fixture base, and the convex lens must be located between the candle and the light screen so that their centers are roughly in the same straight line and the same height, so that the purpose is to image in the center of the light screen, so as to facilitate the measurement of object distance and image distance;

2) As can be seen from the figure, the distance from the candle to the convex lens is 15cm, and the focal length greater than 1 times is less than 2 times the focal length.

3) When the candle moves to the left for a certain distance, the object distance becomes larger, the image distance becomes smaller, and the image becomes smaller, so the light screen can be moved to the left to receive the image on the light screen;

4) When the "eye" is put on a myopia glasses, the myopia lens is a concave lens, and the concave lens has a divergent effect on the light and delays the convergence, so the light screen must be kept away from the lens in order to get a clear image on the light screen

So the answer is: (1) on the same straight line;

at the same height;

2) Inverted magnification, slide projector (or projector; cinema projection);

3) Left (or convex lens or candle), become smaller;

4) Stay away

1. The light apparatus seat should be adjusted to a horizontal state on the experimental call-up field;

2. Convex lens.

It should be placed on the ** of the light base, and the candle and the light screen are placed on both sides of the convex lens;

3. The center of the candle flame, the center of the convex lens, and the center of the shouting screen should be adjusted so that the center of the candle flame and the center of the shouting screen are at the same horizontal height.

When doing the experiment of the imaging law of the convex lens, the candle, the convex lens, and the light screen should be placed in turn now. Then adjust the height of the convex lens and the light screen so that their center is on the main optical axis of the convex lens and should be on the center point of the light screen.

The optical axis is on a horizontal line. Before the experiment, do some calculations, such as a real image (observed with a white screen) or a virtual image (the eye directly observes through the lens), and choose the appropriate equipment and style.

First, put candles, convex lenses, and light screens on the light base in turn, light the candles, move the three closer, adjust the center of the flame, convex lens, and light screen at the same height, and then pull them apart for experiments. Just unplug them when tidying up and remember to put them back in the box.

1) How to place and adjust and adjust the purpose: it is to keep the candle flame, the light screen and the prominent lens at the same horizontal height, so that the image is in the light screen;

2) Operation of the experiment: See:

3) Design of experiment **: See:

4) Experimental conclusions:

When the object distance is greater than two times the focal length, it becomes a reduced inverted real image;

When the object distance is equal to two times the focal length, it becomes an equal large inverted real image;

When the object distance is less than two times the focal length and more than one time the focal length, it becomes a magnified inverted real image;

When the object distance is equal to one time the focal length, it is not an image;

When the object distance is less than one time the focal length, it becomes a magnified upright virtual image.

5) The difference between real image and virtual image: The real image is formed by the convergence of actual light, and it is the light that shines directly into our eyes and allows us to see it. The virtual image is formed by the intersection of the opposite extension of the reflected or refracted rays at a point, and we appear to have such an object when in fact that the object does not exist.

6) How to adjust the size of the real image and the virtual image: with the focus as the boundary, the object moves closer to the focus, whether it is a real image or a virtual image, the larger the image formed by the light and loss, and the smaller the image formed by moving away from the focus.

7) The position of the eyes when looking at real and virtual images. When looking at a real image, the eye position is observed in front of the light screen, and when looking at the virtual image, the eye position is observed in front of the lens and through the lens to the direction of the object.

1. The center of the lens, the light screen, and the candle flame are at the same height, and the lens is centered on the same yard imitation straight line; , 4 can refer to the textbook.

5. The actual light of the real image is converging and formed, which can be carried over by the light screen of the model travel and inverted, and the image is on both sides of the lens; The actual light of the virtual image is formed by the convergence of the reverse extension line, which cannot be undertaken by the light screen, and is upright, and the image is on the same side of the lens.

6. When the real image is real, the near image and the far image of the object become larger; In the case of virtual image, the near-image of the object becomes smaller.

7. Look at the virtual image through the lens. The real image does not have to be a simple stool.

U > 2F, F 2F, into an inverted magnified real image, like the opposite side of the object;

u = f, not imaging.

U < f, v > u, into an upright magnified virtual image, the same side of the image.