20 19 What is the examination content of Huizhou public institutions? What are the common optical test sites?

The exam includes written test and interview, and the total score of the exam = written test score ×60%+ interview score ×40%. The total score of the exam should be rounded to three decimal places. Candidates who apply for the same position have the same total score, and the ranking is determined according to the order of written test scores; If the written test results are still the same, the ranking will be determined according to the score order given by the interview chief judge.

1. written test. The ratio of the number of recruitment positions to qualified candidates must reach 1:3 before the written test can be conducted. If the ratio does not reach 1:3, the number of people to be recruited for this position will be reduced or the recruitment plan for this position will be cancelled accordingly. The written examination takes the form of closed-book examination, and its main contents are general ability test and basic medical knowledge respectively. The full score of the written test is 100, and two decimal places are reserved for the score calculation, and the qualified score line is 60. Those who have not reached 60 shall not be listed as interview candidates. Candidates who meet the conditions of extra points for written test scores and have the status of college student village officials and "three supports and one support" in our province will not be given extra points if their original written test scores do not reach the 60-point qualifying line.

The written test time, place, relevant arrangements and written test results shall be published on the portal website of the District Management Committee and its departmental channels (District People's Social Security Bureau) according to relevant regulations.

2. Interview. Structured interview is implemented, that is, the interviewer asks questions and the interviewer answers them to evaluate the interviewer's basic quality and work ability. The interview time for each candidate is generally 15 minutes. According to the order of written test scores from high to low, according to the ratio of the number of recruitment positions to the number of interviewers (including tied scores), the interviewers are determined in turn. If the number of interviewees does not reach the specified proportion, the interview will be organized according to the number of people who actually meet the interview conditions. Before the release of the interview announcement, if the interviewer gives up the interview qualification due to irresistible circumstances, the recruiting unit or its competent department may fill in the interview candidates from high score to low score within the qualified score line of the application position. The list of candidates for interview will be published on the portal website of the District Management Committee and its departmental channel (District People's Social Security Bureau) within 20 working days after the written examination.

The full score of the interview is 100, and two decimal places are reserved for the score calculation. The qualified score is 60 points, and those whose interview scores are lower than 60 points shall not be listed as physical examination objects.

In the examination of public institutions, optical problems often appear. Although most of the topics are not too difficult, there are also some topics that are easy to make mistakes, mainly due to the incomplete understanding of optical knowledge. Let's analyze the test sites that often appear in the optical knowledge test.

First, optical common sense

Light is an electromagnetic wave visible to human eyes, also called visible spectrum. Light is composed of photons as basic particles, which has particle property and fluctuation, and is called wave-particle duality. In the scientific definition, light refers to all the electromagnetic spectrum. The range of visible light is not clearly limited, and the wavelength of light acceptable to ordinary people's eyes is between 380-760nm. Light can propagate in transparent substances such as vacuum, air and water. The light people see comes from the sun or with the help of light-emitting devices, including incandescent lamps, fluorescent tubes, lasers, fireflies and so on. Because light is an indispensable substance for human survival.

1. Seven colors of sunlight

Under the action of prism, sunlight is dispersed into seven colors of light: red, orange, yellow, green, blue, indigo and purple. After the rain, the rainbow was dispersed by the sun, and the red outside the rainbow arch was arranged from outside to inside.

2. Three primary colors

The three primary colors of light are red, green and blue, and the three primary colors of pigment are red, yellow and blue.

3. Infrared and ultraviolet rays

In the dispersion region of solar light, invisible light other than red light is called infrared light. Infrared rays can heat the irradiated object, which has a thermal effect. Commonly used in infrared detectors, infrared cameras, infrared night vision devices, tracking missiles, etc. In the dispersion region of solar light, invisible light other than violet light is called ultraviolet light. It can make fluorescent substances glow and sterilize. Commonly used in money detectors, ultraviolet sterilization, etc.

Multiple choice question: Which of the following options belongs to the use of infrared rays? ( )

A. infrared guidance B. remote controller C. night vision device D. banknote inspection

Analysis: Infrared rays can heat the irradiated object, which has thermal effect. Commonly used in infrared detectors, infrared cameras, infrared night vision devices, tracking missiles, etc. In the dispersion region of solar light, invisible light other than violet light is called ultraviolet light. It can make fluorescent substances glow and sterilize. Commonly used in money detectors, ultraviolet sterilization, etc. Therefore, this question chooses ABC.

Second, optical phenomena.

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An optical phenomenon. Refers to the phenomenon that when light propagates to different substances, it changes the direction of propagation at the interface and returns to the original substance. When light meets the surface of water, glass and many other objects, it will be reflected. When light changes its propagation direction at the interface between two substances and returns to the original substance, it is called light reflection. The reflected light is on the same plane as the incident light and the normal line; Reflected light and incident light are separated on both sides of the normal; The reflection angle is equal to the incident angle. It can be summarized as: "Three lines * * * plane, two lines are separated, and the two angles are equal." Light is reversible. In the phenomenon of light reflection, the light path is reversible. In life, mirrors, reflections on the water, puddles in the moonlight, periscope and so on all belong to the reflection of light.

2. Refraction of light

When light is obliquely incident from one medium to another, the propagation direction changes, so that light is deflected at the junction of different media. (The deflection angle of light is the largest in vacuum)

The refraction of light, like the reflection of light, occurs at the junction of two media, except that the reflected light returns to the original medium and the refracted light enters the other medium. Because the propagation speed of light in two different substances is different, the propagation direction changes at the junction of two media, which is the refraction of light. In refraction, the optical path is reversible.

In real life, chopsticks are in the water, fish are in the water, mirage, rainbow, rising sun, the river is shallower than the real world from the shore, fishermen have to put fish under the fish and so on. These are all caused by the refraction of light.

3. Linear propagation of light

Light travels in a straight line in the same uniform medium, which is usually called straight line propagation of light. It is an important foundation of geometric optics and can solve the imaging problem simply. The human eye determines the position of an object or an image according to the straight-line propagation of light, which is a part of physical optics. In real life, the light of flashlight, the formation of shadow, pinhole imaging, solar eclipse, lunar eclipse, laser collimation and queuing are all due to the straight-line propagation of light.

Multiple choice question: What are the following phenomena that are not light reflection? ( )

A. Watching the movie screen B. Light propagates in the optical fiber C. Looking in the mirror D. A puddle in the moonlight

Analysis: The propagation of light in optical fiber belongs to refraction. So choose B.

For the study of optics, we must thoroughly understand every knowledge point, so that we can do the problem with ease. If we can study with enthusiasm for science and learn more about military and scientific news, our study will get twice the result with half the effort.