Experimental method of plane mirror imaging

The experimental method of plane mirror imaging is equivalent substitution method.

Experimental method:

The experimental method of plane mirror imaging is called equivalent substitution method, and glass plates are used to replace plane mirrors and candles for experiments. Equivalent substitution method refers to that in order to simplify the problem, one physical quantity is often used to replace all other physical quantities without changing the physical effect.

Specific methods:

Place the glass plate with bracket vertically on a ruler (without a vanity mirror), divide a candle into two equal parts, take half of the candle and light it at one end of the ruler. Take another candle of the same length and put it at the other end of the ruler.

Move the candle, observe the image of the lit candle from the side of the lit candle, and move the unlit candle to make it coincide with the image of the lit candle. At this time, the unlit candle seems to be lit.

Pay attention to the size of the contrast image during the experiment; Measurement (this experiment only needs to read the data on the scale) compares the object distance, the size of the distance, the image and the distance from the object to the glass, that is, the distance and the object distance.

Find out where the virtual image is, remove the unlit candle, put a piece of white paper where there is a virtual image, and observe whether there is a virtual image on the paper. Fill the read data into the record table. According to the recorded data and observed experimental phenomena, the imaging law of plane mirror can be summarized.

The main methods of equivalent substitution method:

A, the ideal modeling method (modeling method):

That is, abstract physical phenomena are represented by simple and understandable concrete models. For example, the atomic structure is represented by the solar system model, the lever is represented by simple lines, and light and magnetic induction lines are introduced.

Second, the amplification method:

A physical method that transforms tiny and unobservable physical phenomena into obvious experimental effects through experimental means.

Third, the control variable method:

Various phenomena occurring in nature are often complicated. There are often many factors that determine the emergence and change of a phenomenon.

In order to find out the reasons and laws of things changing, we must try to artificially control one or several factors to keep them unchanged, and then compare and study the relationship between the other two variables. This scientific method of studying problems is the "control variable method". Controlled variable method is a branch application of the most basic method induction in natural science.