Why is the focal length of a convex lens smaller The stronger the convergence effect of the lens on

Because the shorter the focal length of the convex lens, the greater the angle between the light refracted by the lens and the original incident light, that is, the greater the change angle of the direction of the original light, so its convergence effect on the light is stronger.

Convex lens imaging rules.

It is a law of optics. In optics, the image that is formed by the convergence of actual light rays and can be presented on the optical screen is called a real image; An image that is formed by the convergence of the reverse extension lines of light rays and cannot be displayed on the light screen is called a virtual image.

When talking about the difference between real and imaginary images, it is often mentioned that the distinction is as follows: "Real images are upside down, while virtual images are upright." ”

If it is a thick meniscus concave lens.

The situation will be more complicated. When the thickness is large enough, it is equivalent to the Galilean telescope.

When the thickness is larger, it also acts as a positive lens.

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In fact, the sentence should be "the smaller the focal length of the convex lens, the stronger its ability to refract light".

The ability of a convex lens to refract light is determined by its curvature. The thicker the middle, the greater the ability to refract, which means that the parallel rays are refracted through the lens closer to the main optical axis. its shorter focal length.

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The above figure has a strong refractive ability. The refractive ability below is weak!

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The shorter the focal length, the greater the deflection angle, so the greater the ability to converge light.

The convex lens has a converging effect on light, as shown in the figure below: the larger the focal length of a lens, the smaller the deflection of light, and the smaller the focal length of the C lens, the greater the deflection of light, that is, the stronger the convergence effect of light.

So the answer is: convergence; Strong

The shorter the focal length of the convex lens, the greater the angle between the light refracted by the trembling lens and the original incident light, that is, the greater the change angle of the cavity to the original light direction, so its convergence effect on light is stronger.

In general, the shorter the focal length, the greater the magnification.

1.Explanation: Convex lenses are made according to the principle of refraction of light.

Convex lenses are thicker lenses with thinner edges. Convex lenses are divided into the forms of double convex, plano-convex and concave-convex, 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 and converging, which is related to the thickness of the lens. Farsighted glasses are convex lenses.

2.Imaging Principle:

1) Outside the double focal length, inverted to reduce the real image; Double focal length and other sizes.

2) 1x the focal length to 2x the focal length, inverted to magnify the real image; One time the focal length is not imaging.

3) Within one time of the focal length, the virtual image is magnified upright.

4) The real image and image are on the opposite side of the convex lens, and the virtual image is on the same side of the convex lens.

5) Double the focal length to divide the virtual and the real.

6) Twice the focal length is divided into sizes.

Convex lenses have different focal lengths depending on their light-gathering ability

Different materials, the ability to refract light is different, mainly related to the density of the material When the light passes through the prism, due to the refraction of light, the light will be deflected to the bottom edge, and the degree of deflection is related to the thickness of the prism, and the law of refraction of light must be followed The convex lens is equivalent to a combination of multiple prisms So the size of the focal length of the convex translucent reed mirror is also related to the thickness of the convex lens

So the answer is: materials; Thickness

The thicker the lens of a convex lens, the shorter the focal length.

Because the smaller the radius of curvature of the arc of the convex lens, the higher the convex middle of the lens, the greater the thickness of the lens, and the shorter the focal length of the lens.

Right. Under the condition that the radius of curvature of the convex lens surface remains unchanged, the thicker the convex lens, the smaller the focal length.

The surface of the convex lens is arc-shaped, it is part of the circle, and the radius of the arc can be measured, and this radius is called the radius of curvature of the arc of the lens. The smaller the radius of curvature, the higher the convex middle of the lens, the greater the thickness of the lens, and the shorter the focal length of the lens.

That's right. In general, the thicker the convex lens, the smaller the focal length, when the radius of curvature of the convex lens surface remains unchanged.