Scientific questions about convex lenses, concave lenses, reflectors

Q4 No, it won't.

Q2 The refraction of light occurs.

Q1, convex lens uq3, the shape of the image remains the same, but the brightness of the image decreases. It's like it's going to get darker.

Q4, no, this is like covering part of the lens with something, it will only weaken the brightness of the light and darken the image Q2, the concave lens has a divergent effect on the light, so the light through the concave lens will not converge on the light screen, and it will become a virtual image.

Q1: You didn't get it right.

Q2 because it is upright.

Q3 will only dim.

Q4 No, it will be on the candle, and it will be the same as Q3.

OK The first time, I have a sense of accomplishment, I am the first year of junior high school, so I am familiar!

First, concave lenses.

The convex lenses are thin lenses, and the direction of light propagation through the optical center of the concave and convex lenses does not change;

Secondly, in terms of the convex lens, the rays parallel to the main optical axis are refracted through the convex lens, and the rays that are refracted through the convex lens are emitted through the focal point, and the rays that are refracted into the convex lens through the focal point are emitted parallel to the main optical axis.

For the concave lens, the rays parallel to the main optical axis are refracted through the concave lens, and the rays that are refracted through the virtual focus are reversed, and the rays that are hit at the imaginary focus on the other side of the concave lens are refracted and emit parallel to the main optical axis.

The above are the three special rays of the concave lens and the convex lens, as shown below.

Convex lenses have a converging effect on light rays. Convex lenses are made according to the principle of refraction of light, **thicker lenses with thinner edges. Convex lenses are divided into the forms of double convex, plano-convex and concave and convex (or positive meniscus), convex lenses have the effect of converging rays, so they are also called converging lenses, and thicker convex lenses are expected to be far away, converging and other effects, which are related to the thickness of the lens.

Farsighted glasses are convex lenses.

Practical examples include: magnifying glasses, farsighted glasses, cameras, projectors, microscopes, telescopes, etc.

Concave lenses have a divergent effect on light. Concave lens, also known as negative ball lens, has a thin middle and thick edges, which are concave, so it is also called a concave lens. Concave lenses have a divergent effect on light. Myopia glasses are concave lenses.

Examples of practical applications are: myopia glasses, telescopes, etc.

First of all, both concave and convex lenses are thin lenses, and the propagation direction of light through the optical center of the concave and convex lenses does not change.

Secondly, in terms of the convex nucleus and the lens, the light parallel to the main optical axis is refracted through the convex lens and the light is emitted through the focal point, and the light rays that enter the convex lens through the focal point are refracted and emit parallel to the main optical axis.

For the concave lens, the rays parallel to the main optical axis are refracted through the concave lens, and the rays that are refracted through the virtual focus are reversed, and the rays that are hit at the imaginary focus on the other side of the concave lens are refracted and emit parallel to the main optical axis.

The above are the three special rays of the concave lens and the convex lens, as shown below.

Convex lens: It is made according to the principle of refraction of light. Convex lenses are thicker lenses with thinner edges.

Convex lenses are divided into double-convex, plano-convex and concave-convex (or meniscus) and other forms, convex lenses have a convergence effect, so they are also called condenser lenses, and thicker convex lenses are expected to be far, converging and other effects, which is related to the thickness of the lens. Concave lens: also known as negative ball lens, the lens is thin, the periphery is thick, and it is concave, so it is also called a concave lens.

Concave lenses have a divergent effect on light. After the parallel rays are deflected through the concave spherical lens, the rays diverge and become divergent rays, and it is impossible to form a solid focus, and along the reverse extension line of the scattered rays, they intersect at point f on the same side of the projected rays, forming a virtual focus. Concave Lens Three Special Lights The three special lights are lenses in which the center of the lens is thicker than the edges.

Stationery stores sell it there

Yes. Your understanding is correct.

Convex lenses have a converging effect on light rays. Examples are: magnifying glasses, farsighted glasses, cameras, projectors, microscopes, reading glasses, cat glasses.

Concave lenses have a divergent effect on light, examples are: myopia glasses.

Convex lens: The use is concentrating light, e.g. telescopes, telescopes.

Concave lenses: astigmatism Examples are myopia lenses....

1. The convex lens is made by the principle of refraction of light, which has the effect of convergence, while the convex lens is made according to the principle of light reflection, and the main difference between the two is the image formed by the light through the lens. In addition, the two are also used for different purposes, the former can be used for farsighted glasses, and the latter can correct myopia.

2. Regarding convex lens and concave lens, we will learn when we study junior high school physics that they are two different things and have a very wide range of uses in life, and the main difference between the two is the image formed by light passing through the lens.

3. The convex lens is made according to the principle of light refraction, it is thicker in the middle, thinner at the edge, and the generally thicker convex lens is expected to be far away and convergent, while the more common farsighted glasses are made of convex lens.

4. Concave lens, also known as negative ball lens, is made according to the principle of light reflection, the middle is thinner and the edges are thicker, and the images are upright and shrinking virtual images, and its most common use in life is to correct myopia.

1. Convex lens optical path diagram:

1. The light passing through the focal point will be parallel to the main optical axis after being refracted by the convex lens

2. The light parallel to the main optical axis of the excitation will pass through the focus after being refracted by the convex lens

3. The propagation direction of the light passing through the center of light does not change after being refracted by the convex lens

2. Concave lens optical path diagram:

1. The light rays of the extension line passing through the other side of the focal point will be parallel to the main optical axis after being refracted by the concave lens

2. After the light parallel to the main optical axis is refracted by the concave lens, the reverse extension line of the refracted pure line of the light field is over the focus

3. The propagation direction of the light passing through the center of light does not change after being refracted by the concave lens