The simple ON/OFF keystroke on green laser pointer body

 Teacher asked students a question: the laser light from the flashlight issue is how to reach the ceiling to go after, and its path is like? According to your experience or ask someone to make their own perceptions of conjecture. 2 guess Students: just spread along a straight line. Teacher: Students are suspect just along a straight line, then how to check the correctness of our guess what? The new  green laser pointer  also supports the blank screen function.Health: the need to use experimental methods to test. 3 division to design and conduct experiments; good teacher first, before the experiment please recall, the last chapter I explore the tuning fork in order to observe the pronunciation when it is subtle vibration of how we design? Students: for a small iron ball suspended from the next fork, and contact with teachers and tuning fork: the same here in order to get a clear need for a certain experimental phenomena to improve, because the air is too thin, if we direct the light air, then is fired see the spread of light along a straight line. (Presentation to the students) Teacher:  green laser pointer  has totally solved the problem of being operating computers as well as giving a speech.Well, then the teacher talk about the students on the use of the table these simple devices (laser pointer, mosquito coils, matches, mineral water bottle with holes) to the bold design of an experiment to test the light is in the air not along a straight line, and ask someone to discuss the side, while the design experiment, contest was, which way to come up with a good team. Students: discuss exchange Teacher: Well, now a group of students to design experiments that you operate for everyone to see? (Raw power, lit mosquito coils, along the small hole into the mineral water bottle, burning laser pointer will be fired for a mineral water bottle, laser pointer emitted laser show in a mineral water bottle, a clear red line) Teacher: What we see phenomenon?With the help of  green laser pointer , people now have realized the wish that walk everywhere, speak everywhere and point everywhere. Health: light tracks in the mineral water bottle is a straight line division: Well, this group of students is very well designed, so we saw a bottle of mineral water is very clear line, a good validation of the light in a homogeneous air division along the straight line: Next, I gave you a set of experimental equipment (a laser pointer mounted water tank, a little milk, a glass rod), please think about how to verify the light in the water along a straight line of students: the laser pointer directly at the sink in Normal: Well, (presentation), we see the tracks of light in the water yet? Health: There is no division: then ask a student to talk about his thoughts together raw B: to the milk into the tank, then laser pointer fired water division: Well, you look up to demonstrate to everyone (students came to power operation, also appeared in the water line is not very clear) Teacher: Well, please, if I stir the milk, there will be what kind of phenomenon? green laser pointer  can resolve the inconvenience of the normal use of mouse. Health: water appeared again in the air more than just a clear division line: Well, well, indicating that the light in the transparent water mix can be spread along a straight line division: We study the light air in uniform, transparent uniform spread of water along a straight line, then the light in the solid is not also along a straight line it?