Hello all steemians and science lover. Now i want to share the experiment that ever we learned it at School when we were student. This experiment aims knowing and understanding the properties of light and understanding the nature of light creeps straight, penetrates the clear object and can be reflected.
Theoretical basis
A. Properties of Light
1. Light Passing Straight
The light emitted by a light source travels in all directions. If the medium is homogeneous, then light is straight. Evidence of light creeping straight in the beam of sunlight that penetrates into the dark room.
2. Light can be reflected
Reflection of light there are two types of reflection diffuse (diffuse reflection) and regular reflection. The diffuse reflection is a reflection that occurs when light is on a rough or uneven surface. In this reflection, the irradiance rays are irregular. While regular reflections occur when the light on the surface of a smooth, flat, and shiny, such as a mirror. The reflected rays have a regular direction.
Based on the shape of the mirror surface is divided into three kinds of flat mirror, convex mirror, and concave mirror.
3. Light Able to penetrate Object
Events passing through the light in the clear can be seen when looking at a clear plastic, glass, or other clear objects in the direction of the light. The rays can be seen because light can penetrate the clear object. If the light of dark matter (not clear) such as trees, hands, cars, it will form a shadow.
4. Light Can be Described
The decomposition of light (dispersion) is the decomposition of white light into light that has a variety of colors. An example of a rainbow, which occurs as a result of the sunlight described by raindrops.
5. Refractible Light
The event of splitting the direction of light propagation after passing through a different propagation medium is called refraction.
If light comes from less dense substances to more dense substances the light will be biased toward the normal line. For example light from air to water.
Conversely, if light comes from a denser substance to a less dense substance, then light will be refracted away from the normal line. For example light from water to air. Examples of refraction of light that is pencil is inserted into the water will look bent, the bottom of the pond looks shallow.
Tools and materials
Tools and materials used in this lab include:
Ways of working
- Prepare tools and materials (cardboard, scissors, masking tape).
- Cut a 15 x 20 cm cardboard box for 3 pieces and measure 15 x 40 cm for 1 piece.
- Give 1 hole in ¼ part to 3 carton before, take center position.
- Complete the material as shown below:
- After the material is assembled place a candle that burns on the front.
- Observe the candle from the front of the hole and draw the conclusion.
- Prepare tools and materials in the form (candles, flashlights / lasers and plastics).
- Clear plastic sheeting on top of the burning candle, observe then give the lighting from top to bottom the plastic then observe and conclude.
- Prepare tools and materials in the form of a flat mirror.
- Put the mirror on the table alone.
- Give lighting then observe what happens.
Results Observation / Work Results
Based on the observation that the light properties such as light can propagate straight, penetrate the clear and can bounce, which can be seen in the picture below:
Discussion
From the results of the first observation shows that the light of a candle / flashlight from the front of a cardboard circuit that has been given a parallel hole of light can propagate straight.
From the second observation indicates that the light of a candle / flashlight passing through the transparent body can be seen whereas on the contrary in a non-clear body like a light box can not penetrate. So it can be concluded that light can penetrate a clear object.
From the third observation it appears that the flashlight that is directed to a flat mirror can bounce off.
Conclusion
Based on the first observation it is evident that the light of the candle / flashlight from the front of the cardboard circuit that has been given a parallel hole of light can propagate straight.
Based on the second observation when the light of a candle / flashlight passing through the clear object can be seen whereas on the contrary on a non-clear object such as a light box can not penetrate. So it can be concluded that light can penetrate a clear object.
Based on the results of the third observation it is evident that a flashlight directed by a flat mirror can bounce off.
So it is evident that the light properties of which can propagate straight, can penetrate the clear and can bounce.
Sources :
Well deserved! :)
Thanks you..
well deserved my ass.
Good Article... Easy language used
Thanks so much
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@jabez518 good and nice article.
Thanks
Upvoted. I'm going to resteem this now :]
Thanks so much
Ngeri That sagonyan......
Resteemed.
Thanks
Upvoted :)
Thanks
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Picture Teddy Roosevelt out on safari on the Serengeti. He calls one of the new guides over to a place where dung of both elephants and lions is to be seen and asks him what he makes of that; there is only one right answer: "Well Bwana, it looks as if some lions have been by here, and some elephants have been by here too..."
The WRONG answer, unacceptable if the man means to keep his job, would go more like "Well, Bwana, it looks as if some MAGICAL ANIMAL with properties of both lions AND elephants has been by here..."
Isn't that, however, exactly what you see when you open a physics book to the page on "photons(TM)"? When you see evidence of both waves and particles, isn't he most reasonable assumption to be had, simply that both waves and particles are present?
Ralph Sansbury describes experiments in which currents generate electrostatic fields which reverse when the currents reverse and notes that this implies that electrons are not point particles but rather tiny orbital systems in their own right, the charges of the elements of which sum to that of an electron. He notes also that the computed necessary speed of a sub-electron particle (subtron) would get you from here to the Andromeda galaxy in a couple of seconds.
He describes light as an instantaneous force but I don't have an easy time buying the idea of any sort of a force traveling the kinds of distances between us and distant galaxies, and we DO see distant galaxies. Likewise I have no mental picture of any sort of a wave making it here from other galaxies, no matter how much of a "nutrino soup" might extend through space.
Here's what I CAN picture. I can picture energetic processes including fires and plasma discharges throwing off streams of such subtron particles which then traverse the distance across galaxies in seconds as per Sansbury's calculation, and create bow waves through the nutrino soup of our own local environment, i.e. that light amounts to streams of particles and the waves they create. The analogy would be with a machinegun, the light frequency being essentially the rate of fire.
I call this the redneck theory of light. If such a picture should turn out to be valid, it would indicate that light from distant galaxies has only taken a few seconds, and not untold ages, to get to our own local environment.
In other words, scientists might be making a mistake similar to thinking that the sonic crack of bullets flying overhead had traveled from a rifle barrel 800 meters away at the speed of sound. In real life the muzzle report of rifle fire 800 meters away would be barely audible while the sonic crack of bullets, still easily capable of hurting your ears, had arrived at 2700 fps along with the bullets and was being generated locally.
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