How to increase the focusing temperature of a magnifying glass? How to use a magnifying glass as a projector

People use magnifying glasses in daily life and applications, mainly utilizing the principle of magnifying viewing angle of the magnifying glass. Some friends can't help but ask, the larger the magnifying glass, the greater the magnification, and how to increase the focusing temperature of the magnifying glass. Today we will discuss these two related topics and hope they will be useful to you.

Contents of this article

1. How to increase the focusing temperature of the magnifying glass

2. How to use a magnifying glass as a projector

3. Does the larger the magnifying glass, the greater the magnification?

How to increase the focusing temperature of a magnifying glass

There are the following ways to increase the focusing temperature of the magnifying glass:

1. Strong light conditions. Because the lens of the magnifying glass is a convex lens, it has a focusing effect. Therefore, when light shines directly on the magnifying glass, it will focus the light on its surface into a beam. If the temperature is suitable and reaches the ignition point of something, it can ignite the object.

2. The quality of the convex lens of the magnifying glass is high. The high definition and material of the convex lens directly and indirectly determine the size of the focusing temperature.

3. In addition to the self-created temperature conditions, there must be certain external conditions, such as weather and climate. The higher the weather and climate temperature, the faster the spotlight temperature will increase.

How to use a magnifying glass as a projector

tool:

Shoe box, pins, magnifying glass, mobile phone, transparent tape, foam.

method:

1. Prepare a simple shoe box and dig a hole on one side of the shoe box. The size of the hole should be just enough to fit a magnifying glass so that the hole on the shoe box can just hold the magnifying glass.

2. Fix the magnifying glass on one end of the shoe box and use transparent tape to tighten and reinforce it.

3. Choose two pieces of foam that are the same width as the shoe box. First, place the first piece of foam flat on the table, then fix the second piece of foam on the first piece of foam with a pin, and reinforce the first piece of foam with two foam strips on both sides. Keep a gap of the thickness of a mobile phone between the foam strips and the upright foam, and you will have a mobile phone stand.

4. After the mobile phone holder is made, place the mobile phone sideways in this gap.

5. Place the mobile phone holder in the middle of the shoe box, facing the magnifying glass.

6. Turn the picture or video in your phone sideways and upside down, then click the play function to make it into a projector.

The bigger the magnifying glass, the greater the magnification?

The shorter the focal length of the magnifying glass, the higher the magnification.

The magnification of the magnifying glass (convex lens) = 1 250/f, the focal length f is in mm

The thicker the lens is in the center and the thinner it is at the edges, the higher the magnification.

It has no direct relationship with the size of the magnifying glass.

A magnifying glass is a simple visual optical device used to observe the details of an object. It is a converging lens with a focal length much smaller than the clear vision distance of the eye. The size of the image of an object on the retina of the human eye is proportional to the angle (angle of view) between the object and the eye. The larger the angle of view, the larger the image, and the more details of the object can be distinguished. Moving the object closer can increase the angle of view, but it is limited by the focusing ability of the eye. Use a magnifying glass, bring it close to the eye, and place the object within its focus to form a positive virtual image. The function of a magnifying glass is to enlarge the angle of view.