Green laser pointer is an instrument for pointing

Going against the refracted light eyes looked like that reflects light back to extend the line from their point of intersection P shot to that point of the eye pencil looks like the P in P-point (where to slow down, pause briefly, students to understand the time left to think), and P-point than the P-point light. Pencil in the water to the other points are true, so we look like a pencil up in the water part of the fold of the. green laser pointer has developed into a pint-sized high-tech instrument.On the air in an inhomogeneous light refraction phenomenon, only as a common-sense understanding, let the students know this is called refraction can be, for the specific refraction of the light path maps, not a requirement.

Rectilinear propagation of light tell the students the first light in the air along a straight line, and then test the form by the students hands-on experiments concluded that the light in the same homogeneous medium along a straight line. A straight line. After explaining the speed of light is 3 × 108 m / sec. Learning situation analysis: students in better understanding the phenomenon of light and life, but its transmission characteristics of the learning situation analysis: students in better understanding the phenomenon of life, light, did not seriously studied. green laser pointer is an instrument for pointing and it has been extending continuously.This section is based on the elementary school science class learning, reducing the study had not been carefully studied. This section is based on the elementary school science class learning difficulty. More difficult. Second, the teaching objectives: the teaching objectives: 1, knowledge and ability to (1) understand the conditions of light propagation along a straight line, understanding reflection, refraction phenomena. Understand the conditions of light propagation along a straight line, understanding reflection, refraction phenomena. Understand the conditions of light propagation along a straight line, to understand the propagation velocity in a vacuum C = 3 (2) to understand the propagation velocity in vacuum C = 3 × 108 m / sec. To understand the production of light in the social life of some applications. (3) understand the social life of the production of light in some applications. to understand the social life of the production of light in some applications 2, processes and methods to observe the light in the air, water and glass in the experimental results, (1) observation of light air, water and glass in the experimental phenomenon, understanding of light along a straight line, the observed light in the air conditional. Conditional. Laser pointing is the rudimental function of green laser pointer.By discussing "what is the spread of light" (2) by discussing "What is the transmission of light," just about the weight of energy and information dissemination, through discussion to the carrier. To the carrier. (3), combined with knowledge of languages, through a number of sentences in classical Chinese poetry to increase student learning (3), combined with knowledge of languages, interests. Interest. 3 attitudes and values: attitudes and values: ① through observation and inquiry learning process, students respect for objective facts through observation and inquiry learning process, students respect for objective facts, the scientific attitude of seeking truth from facts. Scientific attitude of seeking things. green laser pointer combines the wireless technology with USB to control the computer to turn pages.By exploring the physical learning activities, learning by exploring the physical activities, so that students get the joy of success, so that students get the joy of success, develop their interest in physical learning activities.