Formata de uso de eco subțire, Curs - Partea III

This communication reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein. In additive mixing of colors there are three primary colors: red, green, and blue.

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In the absence of color or, formata de uso de eco subțire no colors are showing, the result is black. If all three primary colors are showing, the result is white. When red and green combine, the result is yellow. When red and blue combine, the result is magenta. Additive mixing is used in television and computer monitors to produce a wide range of colors using only three primary colors.

The three primary colors in subtractive mixing are yellow, magenta, lotus pierderea în greutate cyan. In subtractive mixing of color, the absence of color is white and the presence of all three primary colors is black.

In subtractive mixing of colors, the secondary formata de uso de eco subțire are the same as the primary colors from additive mixing, and vice versa. Subtractive mixing is used to create a variety of colors when printing on paper by combining a small number of ink colors, and also when painting. The mixing of pigments does not produce perfect subtractive pierdere în greutate cauză neintenționată mixing because some light from the subtracted color is still formata de uso de eco subțire reflected.

This results in a darker and desaturated color compared to the color that would be achieved with ideal filters. What you need Transparent plastic paper 6 7 Material Lamps incandescent and luminescent Prism White screen Diffraction grating or spectroscop What is in the white light? Observation The incandescent lamp has a continuous spectrum, and the luminescent has a discontinuous. Both gives a senation of white color.

Conclusion The white light is polychromatic and is constituted of all the visible colors incandescent light A Red Green Blue light can also give a white sensation luminescent light 8 The image and object positions are symmetrical in a plane mirror glass plate.

Stand one candle in front 0f the glass plate as the object. Place the second candle behind the glass plate as the image catcher. Let the ray of light go through. On a screen placed in front of the ray of light you will see the rainbow: the seven colors of the rainbow. The colors create the light that is not white at all, but it s a collection of various colors.

How do we prove that mixing the set of the colors? We obtain the white?

Curs - Partea III

Let s verify it Take a paperboard disk and divide it in 7 wedges and color each of them with a different color of the rainbow. Put it on a bicycle wheel, or make a hole in the center and put a stick in. Turn the disk faster and you will see that it will become optically white. The time you need to observe depends on the sunshine.

Procedure 1 Cut two small pieces of aluminum 10 cm long and 7. Fold them as to obtain two stripes of 10 x 2. Cut a little of the upper part of one stripe and a little of the lower part of the other, fit the two parts in.

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Fix the other end of the thread to the piece of cardboard then drop the two aluminum stripes inside the jar and put the board as its cap. Put the jar in the sun and start your observation. What happens When the sun warms the jar the two stripes will start turning slowly. Why it happens Black absorbs all light and so also heat that light carries with it, while aluminum reflects light. The intent of the proposed activities is to let students think about the vision of the objects and how they are reflected from a surface, by proposing them simple experiences that can be set in a basic geometric model of the light rays and their journey.

Before these experiences children had the opportunity to observe and to experience light sources, lighted objects and the propagation of light. To better highlight the path of the light rays we scatter a bit of chalk dust. We draw with a marker the half-lines that identify the beam that hits the mirror incident ray and the beam that goes out from the mirror reflected ray.

Descriere Sampon si gel de dus pentru copii si bebelusi Eco Bio baby Anthyllis, bio, ml Descriere — Samponul si gelul de dus Baby Anthyllis contine un agent de curatare delicat din ulei de masline, provenit din agricultura ecologica. Utilizare — Turnati direct 10ml de sampon 1 lingura in apa calduta pentru baie aproximativ 20 litri. In cazul in care nu sunteti la adresa in momentul sosirii curierului, puteti apela la o alta persoana pentru receptionarea acestuia.

What can we conclude from the data collected? When the light strikes the mirror perpendicularly which is the measure of the angle of incidence? And that of the angle of reflection? Which is the maximum amplitude that the angle of incidence can reach? We formulate some hypotheses about dieta nasa and we test them.

Can you say that the laws of reflection are valid whatever the inclination of the incident ray is? Target : to demonstrate that the number of of images reflected by two mirrors hinged to each other varies as the angle of reflection varies.

If you multiply the number of imagesincluding the nail, by the angle formed by the mirrors, what value is it? What do we notice if the angle formed by the mirrors is °?

And if the angle is 0°formata de uso de eco subțire is if the mirrors are parallel? What do we observe putting one or two formata de uso de eco subțire between the mirrors? And placing a ping pong ball half - colored? Starting from O draw from the sides of the axis NS the angles: 11°, 22°, 35°, 51°, 69°, 90°.

Note down the corresponding time from the dial. Then fix a bent straw with an equal angle from the latitude from the place you are.

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Show with the compass the direction N-S and point the line NS on the indicated direction from the compass. Explication: The shadow left by the straw on the dial the solar time. Attention at the change between the winter and summer time. Cut formata de uso de eco subțire carton so that the two square holes will be smaller than the mirrors; then cut the four slots 45° where the mirrors will be introduced.

Look out the window pointing the periscope to a hidden object behind a corner or a wall. Level 2 years old Explanation:The reflected light of an object anthers the periscope and falls on the first mirror under an incident angle of 45°, being reflected under a reflexive angle equal with the incident angle measuring 45°.

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On the second mirror, the light falls under the same incident angle of 45°, being reflected to our eyes parallel with the initial direction. Level 3 years old Invisible needle Are you curious to know how a needle can become invisible? Materials: - formata de uso de eco subțire - polystyrene form trays of food packing or a cork - a glass of water - scissors How to do it: -on the polystyrene draw a circle and after that cut it -fix the needle in the center of the circle and put the disc to float on the surface of the water in the glass making sure that the needle is under water -look obliquely at the needle, from above.

Instead, if the disc is big enough, you find that no matter how much you try you can not see the needle, as it would become invisible. You will see it as sticking above the disc. This experiment is explained with the phenomenon of total reflection. The thin tube is introduced in the hole and glue or sticky tape is used to close it hermetically.

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Use a finger to cover the hole while filling in the plastic bottle with water; after that you uncover the hole and orientate the laser ray so that the water jet might become bright. Explanation The refractive index of the water is bigger than the air refractive index. That is why the total refraction phenomenon can take place. Conclusion If the ray of light falls on a separation surface between an area with a refractive index bigger and one with a refractive index smaller under a bigger or equal angle to the limit angle of the ray of light that reflects itself totally.

Put some balls aprox. Observe what happens with the balls. You need patience; the experiment is developing very slowly. Half an hour One hour Twohours Conclusion 1: the balls are growing up and becoming less and less visible, that means that the optical properties of the balls are closer and closer to the water ones.

Changing the water in the glass we are verifying again that the balls are invisible. Then we take out the balls and analyze them. Conclusion 2: The balls are approximately spherical with a diameter of mm;they are transparent and rigid enough to be manipulated easily.

What we can do with them? Of course we can use them for our flowers But! Look at the last image. We formata de uso de eco subțire discovered that our balls are lenses. That means that we can use them for optical experiments. Photography for example. At Meldrum School we share the aim or purpose of the lesson with the children before we start, we call this the Learning Objective LO. The children therefore know what it is they are learning about and can then evaluate their learning experiences at the end of the lesson to assess how successful they have been.

This is because. We see objects when light bounces off them and into our eye. Draw arrows below to show how this works. LO-to explain how we see.

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Name: 27 L. What I will do. I will look at each light source in the same way every time, to make it fair.


I will record my findings in a table. You can then use pencil to draw a shadow in the right place. When it hits an object, the light scbor goes th it. Shadows are formed when something the light. Materials that block the light are called. When we see things, enters our eyes. How does light travel? What words do we use to describe where light comes from?

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When light hits an object, what are the three things that can happen? You can draw a diagram if you wish. Explain how we see things draw and label a diagram, including these things: pupil, eye, light beam, light source, object, light ray bouncing off the object. Some helpful words: Straight line light source opaque blocs through bounces scatters source straight How We See Things 32 33 In your science books, write and complete these sentences. Light travels… 2.

The words that we use to describe where light comes from are … 3. When light hits an object, the three things that can happen are … 4. Shadows are formed when… draw a diagram if you wish.

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We see things when … draw and label a diagram, including these formata de uso de eco subțire pupil, eye, light beam, light source, object, light ray bouncing off the object. Some helpful words Straight line light source opaque blocs through bounces scatters source straight How We See Things 34 Shadow Formation Investigate how shadows are formed by placing objects on an overhead projectoror shining a torch behind them formata de uso de eco subțire draw what you see.

Object Shadow 35 What did you find out? What did you notice about the shape of the shadow compared to the shape of the object? What did you notice about the position of the shadow to the object and the light? Put the following in the correct order to show how shadows are formed object shadow lamp 4. What do you notice about the size of the shadow compared to the size of the object?

Use your table and graph to answer the following questions: 1.

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When was your shadow smallest? When was your shadow largest? What is the relationship between the size of the shadow and the position of the object to the light source?

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What is the smallest the shadow could get? Can you predict what size the shadow would be if the object was 10cm. How could you have made your investigation more reliable? Put the netball post upright in an open space 2.

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Mark this spot with chalk 3. Measure the length of the shadow on the ground 4. Record the distance on a table.

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Record this also on a sheet marking in the time, the position of the sun and the length of shadow formed the shadow needs to be one tenth of the measured shadow. Draw this line on the ground and write the time it was measured.

Repeat the measurements and drawings each hour. Timeofday 40 41 Conclusion — what we found out Did the shadow stay in the same place?